Specify port after path in address in agent register api

Version: API V1 (API limitation, not specific to a specific client or server version).

How do I register a service IP with a path after port, like `ip:port/servicepath`, in the agent register API?

This is not in the API: https://www.consul.io/docs/agent/http/agent.html#agent_service_register

Start with the Agent Service Register API documentation linked in the issue and inspect how service addresses, ports, and paths are currently represented. Determine whether the API can support an address such as `ip:port/servicepath`, and define completion as documented, working registration behavior with an accompanying test or clear API limitation.

Written by the indexing model from the issue text.