feat: --grpc-port cli flag

[sergeytimoshin]

• add --grpc-port flag for test-validator CLI command.
• enabled configurable logging via RUST_LOG for spawned processes.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sergey/grpc-cli-flag

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