Initial merge changes

Added Execution Payload from Rayonism Fork

Updated new Containers to match Merge Spec

Updated BeaconBlockBody for Merge Spec

Completed updating BeaconState and BeaconBlockBody

Modified ExecutionPayload<T> to use Transaction<T>

Mostly Finished Changes for beacon-chain.md

Added some things for fork-choice.md

Update to match new fork-choice.md/fork.md changes

ran cargo fmt

Added Missing Pieces in eth2_libp2p for Merge

fix ef test

Various Changes to Conform Closer to Merge Spec

testing/ef_tests/src/cases/operations.rs

@@ -72,7 +72,7 @@ impl<E: EthSpec> Operation<E> for Attestation<E> {
             BeaconState::Base(_) => {
                 base::process_attestations(state, &[self.clone()], VerifySignatures::True, spec)
             }
-            BeaconState::Altair(_) => altair::process_attestation(
+            BeaconState::Altair(_) | BeaconState::Merge(_) => altair::process_attestation(
                 state,
                 self,
                 0,