feat: support running ASGI app with Uvicorn using file descriptor

[minhyeoky]

Description

It is common to use a process manager like Supervisor. In such cases, we typically pass a file descriptor instead of binding to a host and port directly. Currently, it is possible to pass the value to Uvicorn.Config via run_extra_options, but it needs to be cast as an integer.

https://www.uvicorn.org/deployment/#supervisor

faststream run "path-to-app" --fd=0

Type of change

Please delete options that are not relevant.

• [x] New feature (a non-breaking change that adds functionality)
• [x] This change requires a documentation update

Checklist

• [x] My code adheres to the style guidelines of this project (scripts/lint.sh shows no errors)
• [x] I have conducted a self-review of my own code
• [x] I have made the necessary changes to the documentation
• [x] My changes do not generate any new warnings
• [ ] I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• [x] Both new and existing unit tests pass successfully on my local environment by running scripts/test-cov.sh
• [x] I have ensured that static analysis tests are passing by running scripts/static-analysis.sh
• [x] I have included code examples to illustrate the modifications

[Lancetnik]

Thank you a lot for the improvement!