[Feature] Add argument to disable FastAPI docs

[mouweng]

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Motivation

This PR is to add a new argument option to disable the /, /openapi.json, /redoc and /docs/oauth2-redirect. My company doesn't allow using such endpoints in production environments. A new argument is added to disable the endpoint

reference doc: https://fastapi.tiangolo.com/tutorial/metadata/

Modification

Add argument --disable-fastapi-docs

BC-breaking (Optional)

N/A

Use cases (Optional)

lmdeploy serve api_server facebook/opt-125m --disable-fastapi-docs

• Before
  

• After
  

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit tests to ensure the correctness.
3. If the modification has a dependency on downstream projects of a newer version, this PR should be tested with all supported versions of downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.