MessageClient can Pub/Sub binary data without MessageEnvelope wrapped.

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PR Checklist

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• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
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Testing Instructions

New Dependency Instructions (If applicable)