* Init cli RpcClient with chosen commitment; default to single_gossip
* Fill in missing client methods
* Cli tests: make RpcClient commitment specific
* Simply rpc_client calls, using configured commitment
* Check validator vote account with single-gossip commitment
* Add optimistically_confirmed field to TransactionStatus
* Update docs
* Convert new field to confirmation_status
* Update docs to confirmationStatus
* Update variants
* Update docs
* Just Confirmed