Ticket #23273 found a flaw where we were unable to sign legacy-transactions
using the external signer, even if we're still on non-london network. That's
fixed in this PR.

Additionally, I found that even when supplying all parameters, it was impossible
to sign a london-transaction on an unsynched node. It's a pretty common usecase
that someone wants to sign a transaction using an unsynced 'vanilla' node,
providing all necessary data. Our setDefaults, however, insisted on checking the
current block against the config. This PR therefore adds a case, so that if both
MaxPriorityFeePerGas and MaxFeePerGas are provided, we accept them as given.

OBS This PR fixes a regression -- on current master, we are unable to sign a
london-transaction unless the node is synched, which may break scenarios where
geth (or clef) is used as a cold wallet.

Fixes #23273 

* internal/ethapi: fix transaction APIs

* internal/ethapi: fix typo

* internal/ethapi: address comments

* internal/ethapi: address comment from Peter

* all: rename internal 1559 gas fields, add support for graphql

* cmd/evm/testdata, core: use public 1559 gas names on API surfaces

* internal/ethapi: add baseFee to RPCMarshalHeader

* internal/ethapi: add FeeCap, Tip and correct GasPrice to EIP-1559 RPCTransaction results

* core,eth,les,internal: add support for tip estimation in gas price oracle

* internal/ethapi,eth/gasprice: don't suggest tip larger than fee cap

* core/types,internal: use correct eip1559 terminology for json marshalling

* eth, internal/ethapi: fix rebase problems

* internal/ethapi: fix rpc name of basefee

* internal/ethapi: address review concerns

* core, eth, internal, les: simplify gasprice oracle (#25)

* core, eth, internal, les: simplify gasprice oracle

* eth/gasprice: fix typo

* internal/ethapi: minor tweak in tx args

* internal/ethapi: calculate basefee for pending block

* internal/ethapi: fix panic

* internal/ethapi, eth/tracers: simplify txargs ToMessage

* internal/ethapi: remove unused param

* core, eth, internal: fix regressions wrt effective gas price in the evm

* eth/gasprice: drop weird debug println

* internal/jsre/deps: hack in 1559 gas conversions into embedded web3

* internal/jsre/deps: hack basFee to decimal conversion

* internal/ethapi: init feecap and tipcap for legacy txs too

* eth, graphql, internal, les: fix gas price suggestion on all combos

* internal/jsre/deps: handle decimal tipcap and feecap

* eth, internal: minor review fixes

* graphql, internal: export max fee cap RPC endpoint

* internal/ethapi: fix crash in transaction_args

* internal/ethapi: minor refactor to make the code safer
Co-authored-by: NRyan Schneider <ryanleeschneider@gmail.com>
Co-authored-by: Nlightclient@protonmail.com <lightclient@protonmail.com>
Co-authored-by: Ngary rong <garyrong0905@gmail.com>
Co-authored-by: NPéter Szilágyi <peterke@gmail.com>

There are two transaction parameter structures defined in
the codebase, although for different purposes. But most of
the parameters are shared. So it's nice to reduce the code
duplication by merging them together.
Co-authored-by: NMartin Holst Swende <martin@swende.se>