v1.1.1 spec updates (#2684)

* update initializing from eth1 for merge genesis

* read execution payload header from file lcli

* add `create-payload-header` command to `lcli`

* fix base fee parsing

* Apply suggestions from code review

* default `execution_payload_header` bool to false when deserializing `meta.yml` in EF tests

Co-authored-by: Paul Hauner <paul@paulhauner.com>

beacon_node/client/src/builder.rs

@@ -234,6 +234,7 @@ where
                     &keypairs,
                     genesis_time,
                     Hash256::from_slice(DEFAULT_ETH1_BLOCK_HASH),
+                    None,
                     &spec,
                 )?;
                 builder.genesis_state(genesis_state).map(|v| (v, None))?