gRPC: UTxORPC `SubmitTx` method of submit service

[CarlosLopezDeLara]

Implement an RPC server integrated directly within cardano-node supporting the LocalTxSubmission mini-protocol.

This task covers:

• transaction submission endpoint,
• error propagation,
• handling node-client interactions.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 120 days.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 120 days.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 120 days.