refactor(base_types,types,tests): Create RLP Serialization Classes

[marioevz]

🗒️ Description

Creates RLPSerializable and SignableRLPSerializable that can be inherited by a class to make it RLP serializable.

RLPSerializable

When inherited by a class, and the class defines the rlp_fields class variable as a list of strings, the method rlp will now return an RLP encoded bytes that is composed by the fields named in the ordered rlp_fields.

The method will automatically convert the fields into values accepted by ethereum_rlp.encode.

If the field contains an object that is also RLPSerializable (or SignableRLPSerializable), it will call a method called to_list which returns the object's fields a list that is already converted to values accepted by ethereum_rlp.encode, so the encoding will treat this sub-field as a list of elements instead of an array of bytes.

SignableRLPSerializable

Similar to RLPSerializable but it can also produce RLP encoded bytes that are meant to be signed with a private key, and also requires implementation of a sign method.

E.g. AuthorizationTuple contains the following RLP related fields:

rlp_fields: ClassVar[List[str]] = ["chain_id", "address", "nonce", "v", "r", "s"]
rlp_signing_fields: ClassVar[List[str]] = ["chain_id", "address", "nonce"]

Which means that the sign method will use an RLP encoded bytes composed of only ["chain_id", "address", "nonce"], whereas the full RLP encoded object is composed of those same fields plus the ["v", "r", "s"] of the signature.

Note: we could improve the names of both of these classes, suggestions welcome.

Testing Opportunities

While this PR only refactors and does not introduce many more functionality, it introduces the possibility of automatically generating tests for RLP encodeable objects, since the objects and their composition based on their fields are now better defined.

Test parity

Test fixtures were generated using uv run fill --from=Cancun --until=Prague -n auto -m "not slow and not eip_version_check" against main generated functions (plus #1357 and #1358) and the resulting fixtures were identical.

🔗 Related Issues

None

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• Tests: All converted JSON/YML tests from ethereum/tests have been added to converted-ethereum-tests.txt.
• Tests: A PR with removal of converted JSON/YML tests from ethereum/tests have been opened.
• Tests: Included the type and version of evm t8n tool used to locally execute test cases: e.g., ref with commit hash or geth 1.13.1-stable-3f40e65.
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.

[spencer-tb]

Great refactor from my side! Just a few comments :)

I quite like the class naming btw

[spencer-tb]

LGTM! ;)