Add CLA check action

[kneth]

Summary of the changes / Why this is an improvement

CONTRIBUTING.rst is referring to https://github.com/crate/crate/blob/master/CONTRIBUTING.rst which has information about CLA

Checklist

• Link to issue this PR refers to (if applicable): Fixes #???

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kneth/cla-check

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