Add deserialize fn

Author: lucassaldanha

pysetup/spec_builders/electra.py

@@ -10,7 +10,7 @@ class ElectraSpecBuilder(BaseSpecBuilder):
     def imports(cls, preset_name: str):
         return f'''
 from eth2spec.deneb import {preset_name} as deneb
-from eth2spec.utils.ssz.ssz_impl import serialize
+from eth2spec.utils.ssz.ssz_impl import serialize, deserialize
 '''
 
     @classmethod

specs/electra/validator.md

@@ -189,13 +189,11 @@ in [EIP-7685](https://eips.ethereum.org/EIPS/eip-7685). The index of each elemen
 
 ```python
 def get_execution_requests(execution_requests: list[bytes]) -> ExecutionRequests:
-    requests = ExecutionRequests()
+    deposits = deserialize(DepositRequest, execution_requests[0])
+    withdrawals = deserialize(WithdrawalRequest, execution_requests[1])
+    consolidations = deserialize(ConsolidationRequest, execution_requests[2])
 
-    requests.deposits = deserialize(execution_requests[0], DepositRequest)
-    requests.withdrawals = deserialize(execution_requests[1], WithdrawalRequest)
-    requests.consolidations = deserialize(execution_requests[2], ConsolidationRequest)
-
-    return requests
+    return ExecutionRequests(deposits, withdrawals, consolidations)
 ```
 
 ## Attesting

tests/core/pyspec/eth2spec/utils/ssz/ssz_impl.py

@@ -8,6 +8,8 @@
 def serialize(obj: View) -> bytes:
     return obj.encode_bytes()
 
+def deserialize(cls: View, data: bytes) -> object:
+    return cls.decode_bytes(data)
 
 def hash_tree_root(obj: View) -> Bytes32:
     return Bytes32(obj.get_backing().merkle_root())