The initial wording does not make sense due to an extra 'to'.

There are two potential candidates we can change this to:
 - 'you can import it into scope'
 - 'to import it into scope'

In keeping the changes minimal, we choose the first, as this is more in line with the grammar of the extended candidates help message.

This commit adds functionality that allows the name resolution pass
to search for entities (traits/types/enums/structs) by name, in
order to show recommendations along with the errors.

For now, only E0405 and E0412 have suggestions attached, as per the
request in bug #21221, but it's likely other errors can also benefit
from the ability to generate suggestions.

These explicit lifetimes can be ommitted because of lifetime elision
rules. Instances were found using rust-clippy.

Replace the field `imports` in Module with `unresolved_imports` and refactor away `resolved_import_count`

Rename Module field anonymous_children to module_children, expand it to include both named an anonymous modules, and fix #31644

Refactor away resolve_name_in_module in resolve_imports.rs

Rewrite and improve the core name resolution procedure in NameResolution::result and Module::resolve_name

Refactor the duplicate checking code into NameResolution::try_define

Refactor away the fields id and is_public of ImportResolution and rename ImportResolution to NameResolution

NameBinding now encodes these directly with binding.is_public() and (binding.is_public() && binding.is_import()) (respectively)