RPC queries at a given height

[tzemanovic]

implement query.height support client queries where it's supported:

• epoch
• storage values
• also in newly added block add client block query #659

We can add height to the shared args::Query.

[tzemanovic]

OpenAPI spec will need to be updated for this (adding in anoma/anoma#1228)

[cwgoes]

@tzemanovic do you know the status of this?

[tzemanovic]

@tzemanovic do you know the status of this?

storage values RPC now supports height, but rest is still tbd

[tzemanovic]

closing, re-open if needed