* Add explanation to help text and flag usage text
* KV get with new mount flag
* Clearer naming
* KV Put, Patch, Metadata Get + corresponding tests
* KV Delete, Destroy, Rollback, Undelete, MetadataDelete, MetadataPatch, MetadataPut
* Update KV-v2 docs to use mount flag syntax
* Add changelog
* Run make fmt
* Clarify deprecation message in help string
* Address style comments
