Network: getnodeaddresses - Implement REST API endpoint for Bitcoin Core method

Implement a REST API endpoint for the `Network`: `getnodeaddresses` method of the Network category in Bitcoin Core.

Begin by reviewing the repository's existing REST endpoints for Bitcoin Core Network methods and identify the entry point for adding getnodeaddresses. Compare the endpoint behavior with the Bitcoin Core getnodeaddresses JSON-RPC method, then add coverage confirming the REST endpoint returns the method's result.

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