feat: expose moq-relay as library

[Frando]

Allows to embed a moq-relay into other binaries.

Doc comments for public items written by Claude, needs review still. Will remove draft label once I did that.

[coderabbitai]

Caution

Review failed

The head commit changed during the review from 9d79800 to 91d1376.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

✨ Simplify code

• Create PR with simplified code

📝 Coding Plan

• Generate coding plan for human review comments

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