feat: implement reverse proxy for custom command services

[frostming]

Signed-off-by: Frost Ming [email protected]

What does this PR address?

Fixes #(issue)

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[hyperlint-ai]

PR Change Summary

Implemented a reverse proxy for custom command services in BentoML, enhancing the service's ability to handle requests.

• Established a proxy service that directs requests to the HTTP server initiated by custom commands.
• Updated documentation to reflect the new proxy functionality and configuration options.
• Specified default proxy port and provided an example for custom command integration.

Modified Files

• docs/source/build-with-bentoml/services.rst

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