add height field to gRPC requests

[noot]

Description

Adds height field to relevant gRPC requests and latest_height bool to override height and query at the latest height.

Following up to my previous PR #5685 - this came up as an issue again when testing IBC with the hermes relayer, as only proofs at the latest height were returned, but this is not the state root we were expecting to compare against, causing verification errors.

Let me know any thoughts/feedback on this approach, if it looks good I can update the rest of the code.

closes: https://github.com/cosmos/ibc-go/issues/149

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