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/store/src/hot_cold_store.rs

@@ -883,6 +883,10 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
                         &mut block.message.state_root,
                         &mut block.message.parent_root,
                     ),
+                    SignedBeaconBlock::Merge(block) => (
+                        &mut block.message.state_root,
+                        &mut block.message.parent_root,
+                    ),
                 };
 
                 *state_root = Hash256::zero();