refactor(bal): Simplify the BlockAccessList class

- The class itself doesn't need to be `RLPSerializable`, just have
  simple instructions to serialize its elements (`rlp()`).

Author: fselmo

src/ethereum_test_types/block_access_list.py

@@ -5,8 +5,9 @@
 these are simple data classes that can be composed together.
 """
 
-from typing import Any, ClassVar, Dict, List
+from typing import Any, ClassVar, List
 
+import ethereum_rlp as eth_rlp
 from pydantic import Field
 
 from ethereum_test_base_types import (
@@ -98,7 +99,7 @@ class BalAccountChange(CamelModel, RLPSerializable):
     ]
 
 
-class BlockAccessList(CamelModel, RLPSerializable):
+class BlockAccessList(CamelModel):
     """
     Expected Block Access List for verification.
 
@@ -132,21 +133,19 @@ class BlockAccessList(CamelModel, RLPSerializable):
         default_factory=list, description="List of account changes in the block"
     )
 
-    rlp_fields: ClassVar[List[str]] = ["account_changes"]
-
-    def to_list(self, signing: bool = False) -> List[Any]:
+    def to_list(self) -> List[Any]:
         """
-        Override to_list to return the account changes list directly.
+        Return the account changes list directly for RLP encoding.
 
         The BlockAccessList IS the list of account changes, not a container
         that contains a list, per EIP-7928.
         """
         # Return the list of accounts directly, not wrapped in another list
         return to_serializable_element(self.account_changes)
 
-    def to_dict(self) -> Dict[str, Any]:
-        """Convert to dictionary for serialization."""
-        return self.model_dump(exclude_none=True)
+    def rlp(self) -> Bytes:
+        """Return the RLP encoded block access list for hash verification."""
+        return Bytes(eth_rlp.encode(self.to_list()))
 
     def verify_against(self, actual_bal: "BlockAccessList") -> None:
         """