Optimizations, disable val client sync check & additional lcli tools (#834)

* Start adding interop genesis state to lcli

* Use more efficient method to generate genesis state

* Remove duplicate int_to_bytes32

* Add lcli command to change state genesis time

* Add option to allow VC to start with unsynced BN

* Set VC to do parallel key loading

* Don't default to dummy eth1 backend

* Add endpoint to dump operation pool

* Add metrics for op pool

* Remove state clone for slot notifier

* Add mem size approximation for tree hash cache

* Avoid cloning tree hash when getting head

* Fix failing API tests

* Address Michael's comments

* Add HashMap::from_par_iter

beacon_node/rest_api/src/validator.rs

@@ -156,6 +156,7 @@ fn return_validator_duties<T: BeaconChainTypes>(
     let relative_epoch = RelativeEpoch::from_epoch(state.current_epoch(), epoch)
         .map_err(|_| ApiError::ServerError(String::from("Loaded state is in the wrong epoch")))?;
 
+    state.update_pubkey_cache()?;
     state
         .build_committee_cache(relative_epoch, &beacon_chain.spec)
         .map_err(|e| ApiError::ServerError(format!("Unable to build committee cache: {:?}", e)))?;