Co-authored-by: weimumu <934657014@qq.com>

* accounts/abi: fix name styling when unpacking abi fields w/ underscores

ABI fields with underscores that are being unpacked
into structs expect structs with following form:

int_one -> Int_one

whereas in abigen the generated structs are camelcased

int_one -> IntOne

so updated the unpack method to expect camelcased structs as well.

* fix slice unpack bug in accounts/abi

accounts/abi: Abi binding support for nested arrays, fixes #15648, including nested array unpack fix (#15676)

* accounts/abi/bind: support for multi-dim arrays

Also:
- reduce usage of regexes a bit.
- fix minor Java syntax problems

Fixes #15648

* accounts/abi/bind: Add some more documentation

* accounts/abi/bind: Improve code readability

* accounts/abi: bugfix for unpacking nested arrays

The code previously assumed the arrays/slices were always 1 level
deep. While the packing supports nested arrays (!!!).

The current code for unpacking doesn't return the "consumed" length, so
this fix had to work around that by calculating it (i.e. packing and
 getting resulting length) after the unpacking of the array element.
It's far from ideal, but unpacking behaviour is fixed now.

* accounts/abi: Fix unpacking of nested arrays

Removed the temporary workaround of packing to calculate size, which was
incorrect for slice-like types anyway.
Full size of nested arrays is used now.

* accounts/abi: deeply nested array unpack test

Test unpacking of an array nested more than one level.

* accounts/abi: Add deeply nested array pack test

Same as the deep nested array unpack test, but the other way around.

* accounts/abi/bind: deeply nested arrays bind test

Test the usage of bindings that were generated
for methods with multi-dimensional (and not
just a single extra dimension, like foo[2][3])
array arguments and returns.

edit: trigger rebuild, CI failed to fetch linter module.

* accounts/abi/bind: improve array binding

wrapArray uses a regex now, and arrayBindingJava is improved.

* accounts/abi: Improve naming of element size func

The full step size for unpacking an array
 is now retrieved with "getFullElemSize".

* accounts/abi: support nested nested array args

Previously, the code only considered the outer-size of the array,
ignoring the size of the contents. This was fine for most types,
but nested arrays are packed directly into it, and count towards
the total size. This resulted in arguments following a nested
array to replicate some of the binary contents of the array.

The fix: for arrays, calculate their complete contents size:
 count the arg.Type.Elem.Size when Elem is an Array, and
 repeat when their child is an array too, etc.
The count is the number of 32 byte elements, similar to how it
 previously counted, but nested.

* accounts/abi: Test deep nested arr multi-arguments

Arguments with a deeply nested array should not cause the next arguments
to be read from the wrong position.

* accounts/abi: handle named ouputs prefixed with underscores

* accounts/abi: handle collinding outputs for struct unpacks

* accounts: handle purely underscore output names

+ Reworked Method Unpack tests into more readable components
+ Added Method Unpack into slice test

Fixes #15617

* accounts/abi: reorganizing package and some notes and a quick correction of name.
Signed-off-by: NRJ Catalano <rj@monax.io>

get rid of some imports
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: move file names
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: fix boolean decode function
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: fix for the array set and for creating a bool
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: be very very very correct
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: fix up error message and variable names
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: take out unnecessary argument in pack method
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: add bool unpack test and add a panic to readBool function
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: fix panic message
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: change from panic to basic error
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: fix nil to false
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: fill out type regex tests and fill with the correct type for integers
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: move packNumbers into pack.go.
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: separation of the testing suite into appropriately named files.
Signed-off-by: NRJ Catalano <rj@monax.io>

* account/abi: change to hex string tests.
Signed-off-by: NRJ Catalano <rj@monax.io>

* account/abi: fix up rest of tests to hex
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: declare bool at the package level
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: use errors package in the error file.
Signed-off-by: NRJ Catalano <rj@monax.io>

* accounts/abi: fix ugly hack and fix error type declaration.
Signed-off-by: NRJ Catalano <rj@monax.io>

solves #3119
Signed-off-by: NVoR0220 <rj@erisindustries.com>

Previously it was assumed that wheneven type `[]interface{}` was given
that the interface was empty. The abigen rightfully assumed that
interface slices which already have pre-allocated variable sets to be
assigned.

This PR fixes that by checking that the given `[]interface{}` is larger
than zero and assigns each value using the generic `set` function (this
function has also been moved to abi/reflect.go) and checks whether the
assignment was possible.

The generic assignment function `set` now also deals with pointers
(useful for interface slice mentioned above) by dereferencing the
pointer until it finds a setable type.

Refactored the abi package parsing and type handling. Relying mostly on
package reflect as opposed to most of our own type reflection. Our own
type reflection is still used however for cases such as Bytes and
FixedBytes (abi: bytes•).

This also inclused several fixes for slice handling of arbitrary and
fixed size for all supported types.

This also further removes implicit type casting such as assigning,
for example `[2]T{} = []T{1}` will fail, however `[2]T{} == []T{1, 2}`
(notice assigning *slice* to fixed size *array*). Assigning arrays to
slices will always succeed if they are of the same element type.

Incidentally also fixes #2379

Fixed up `[]byte` slice support such that `function print(bytes input)`
accepts `[]byte` as input and treats it as 1 element rather than a slice
of multiple elements.

Added support for variable length input parameters like `bytes` and
`strings`.

As we aren't really using the standarized SHA-3

Added support for fixed size and arbitrary length byte arrays to be
marshallable in fixed size (typed) byte slices.