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

validator_client/src/lib.rs

@@ -210,6 +210,7 @@ impl<T: EthSpec> ProductionValidatorClient<T> {
                     .validator_store(validator_store.clone())
                     .beacon_node(beacon_node.clone())
                     .runtime_context(context.service_context("duties".into()))
+                    .allow_unsynced_beacon_node(config.allow_unsynced_beacon_node)
                     .build()?;
 
                 let block_service = BlockServiceBuilder::new()