Clean up query output.

[ethanfrey]

Summary

The mapping from cosmwasm data to the query output is not so clean. We often use string to represent data we know is either (1) binary or (2) json. Let us use []byte/tmbytes.HexBytes for the binary data and json.RawMessage for the json.

Problem Definition

wasmcli query wasm output is often hard to read

Proposal

1. ContractInfo should have json.RawMessage ([]byte alias) for InitMsg
2. types.Model used by QueryMethodContractStateAll and QueryMethodContractStateRaw should not be {string, string}, but {HexBytes, json.RawMessage}

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