* Add `GetWithoutCopy`
* Add `StateByRootInitialSync`
* Use `StateByRootInitialSync` for initial syncing using new-state-mgmt
* Merge branch 'master' into new-state-init-sync-mem
* Skip if split slot is 0
* Merge branch 'new-state-init-sync-mem' of github.com:prysmaticlabs/prysm into new-state-init-sync-mem
* Make sure we invalidate cache
* Add test part 1
* Add tests part 2
* Update beacon-chain/cache/hot_state_cache.go
Co-authored-by: Victor Farazdagi <simple.square@gmail.com>
* Comment
* Merge branch 'new-state-init-sync-mem' of github.com:prysmaticlabs/prysm into new-state-init-sync-mem
* Merge branch 'master' of github.com:prysmaticlabs/prysm into new-state-init-sync-mem
* Dont need to run fork choice and save head during intial sync
* Invalidate cache at onBlockInitialSyncStateTransition
* Merge branch 'new-state-init-sync-mem' of github.com:prysmaticlabs/prysm into new-state-init-sync-mem
* Revert saveHeadNoDB changes
* Add back DeleteHotStateInCache
* Removed extra deletion
* Merge branch 'master' of github.com:prysmaticlabs/prysm into new-state-init-sync-mem
* Proper set splitslot for tests
* Merge branch 'master' into new-state-init-sync-mem
* Merge branch 'master' of github.com:prysmaticlabs/prysm into new-state-init-sync-mem
* Merge branch 'new-state-init-sync-mem' of github.com:prysmaticlabs/prysm into new-state-init-sync-mem