* Move ssz_query objects into testing folder (ensuring test objects only used in test environment)
* Add containers for response
* Export sszInfo
* Add QueryBeaconState/Block
* Add comments and few refactor
* Fix merge conflict issues
* Return 500 when calculate offset fails
* Add test for QueryBeaconState
* Add test for QueryBeaconBlock
* Changelog :)
* Rename `QuerySSZRequest` to `SSZQueryRequest`
* Fix middleware hooks for RPC to accept JSON from client and return SSZ
* Convert to `SSZObject` directly from proto
* Move marshalling/calculating hash tree root part after `CalculateOffsetAndLength`
* Make nogo happy
* Add informing comment for using proto unsafe conversion
---------
Co-authored-by: Radosław Kapka <rkapka@wp.pl>