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

consensus/state_processing/src/genesis.rs

@@ -52,6 +52,8 @@ pub fn initialize_beacon_state_from_eth1<T: EthSpec>(
         state.fork_mut().previous_version = spec.altair_fork_version;
     }
 
+    // TODO: handle upgrade_to_merge() here
+
     // Now that we have our validators, initialize the caches (including the committees)
     state.build_all_caches(spec)?;