Uncomment and fix client query commands

[ancazamfir]

Summary of Bug

The client query commands for state and consensus are currently commented out as the initial query infrastructure was changed.
The code should be uncommented and fixed so it works at least up to the deserialization.

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[ebuchman]

Maybe let's not bother with things that "work up to deserialization" and just fix it once we can go all the way through, including deserialization? Should be soon given progress on tendermint-rs

[ancazamfir]

We will need this for the relayer MVP where we short-circuit the serialization/ deserialization. It's also a good validation that the way we model the multiple client types and their states, consensus, etc. is good.

[adizere]

This is a sub-issue of #128.

The query logic used to be there, unsatisfactory, so it was mostly cut out in #174 where the infrastructure around queries changes. What's left can be seen in relayer/src/query/client.rs.