feature: add http api server's uvicorn option

[gusghrlrl101]

Feature request

Hello.

There are no way to add extra uvicorn options when I serve bentoml. (only runner was added this option in #3198.)

In my case, I want to modify --timeout-keep-alive to 60 seconds (default is 5 seconds)

I think ssl option is added in #2886.

But http_api_server's uvicorn_options can not be modified.

Motivation

It can be used well in production level when who want to specify uvicorn option like timeout-keep-alive or timeout-graceful-shutdown.

Other

No response