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/network/src/subnet_service/tests/mod.rs

@@ -56,6 +56,7 @@ impl TestBeaconChain {
                         &keypairs,
                         0,
                         Hash256::from_slice(DEFAULT_ETH1_BLOCK_HASH),
+                        None,
                         &spec,
                     )
                     .expect("should generate interop state"),