* 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
* Avoid cloning tree hash when getting head
* Add working arena-based cached tree hash
* Add another benchmark
* Add pre-allocation for caches
* Make cache nullable
* Fix bugs in cache tree hash
* Add validator tree hash optimization
* Optimize hash_concat
* Make hash32_concat return fixed-len array
* Fix failing API tests
* Add new beacon state cache struct
* Add validator-specific cache
* Separate list and values arenas
* Add parallel validator registry hashing
* Remove MultiTreeHashCache
* Remove cached tree hash macro
* Fix failing tree hash test
* Address Michael's comments
* Add CachedTreeHash impl for ef tests
* Fix messy merge conflict
* Rename cache struct, add comments
* Rename cache struct, add comments
* Remove unnecessary mutability
* Wrap iter in result
* Tidy cached tree hash
* Address Michael comments
* Address more comments
* Use ring::Context
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