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

beacon_node/eth2_libp2p/src/config.rs

@@ -205,7 +205,9 @@ pub fn gossipsub_config(fork_context: Arc<ForkContext>) -> GossipsubConfig {
     ) -> Vec<u8> {
         let topic_bytes = message.topic.as_str().as_bytes();
         match fork_context.current_fork() {
-            ForkName::Altair => {
+            // according to: https://github.com/ethereum/consensus-specs/blob/dev/specs/merge/p2p-interface.md#the-gossip-domain-gossipsub
+            // the derivation of the message-id remains the same in the merge
+            ForkName::Altair | ForkName::Merge => {
                 let topic_len_bytes = topic_bytes.len().to_le_bytes();
                 let mut vec = Vec::with_capacity(
                     prefix.len() + topic_len_bytes.len() + topic_bytes.len() + message.data.len(),