Gloas payload attestation consensus (#8827)

- Implement `process_payload_attestation`
- Implement EF tests for payload attestations (allows simplification of handler now that we support all `operations` tests).
- Update the `BlockSignatureVerifier` to signature-verify payload attestations


Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

testing/ef_tests/tests/tests.rs

@@ -99,6 +99,12 @@ fn operations_execution_payload_bid() {
     OperationsHandler::<MainnetEthSpec, ExecutionPayloadBidBlock<_>>::default().run();
 }
 
+#[test]
+fn operations_payload_attestation() {
+    OperationsHandler::<MinimalEthSpec, PayloadAttestation<_>>::default().run();
+    OperationsHandler::<MainnetEthSpec, PayloadAttestation<_>>::default().run();
+}
+
 #[test]
 fn operations_withdrawals() {
     OperationsHandler::<MinimalEthSpec, WithdrawalsPayload<_>>::default().run();