Add support for Mars CosmWasm executions

[pharr117]

For on-chain execution of Mars Protocol apps, we need to add support for CosmWasm MsgExecuteContract parsing for Mars contract addresses.

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Blocked by #443

[pharr117]

This issue will be worked on during the development of #443 to allow real-world testing

[pharr117]

Dropping back to the backlog, we are prioritizing #552 first