Add Rust client SDK

[mssun]

Description

Add Rust client SDK.

Type of change (select or add applied and delete the others)

• New feature (non-breaking change which adds functionality)

How has this been tested?

• make run-sdk-tests
• CI result: http://ci.mesalock-linux.org/mssun/incubator-mesatee/1114

Checklist

• Fork the repo and create your branch from master.
• If you've added code that should be tested, add tests.
• If you've changed APIs, update the documentation.
• Ensure the tests pass (see CI results).
• Make sure your code lints/format.

[mssun]

I'll add doc comments later when the APIs becomes table.