Add ruff sort to pre-commit and sort imports in the library

[glevv]

Why are these changes needed?

To maintain clean and lean imports

Related issue number

Closes #1252

Checks

• I've included any doc changes needed for https://microsoft.github.io/FLAML/. See https://microsoft.github.io/FLAML/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[glevv]

I almost sure that some tests will start to fail, so there still some work to be done

[glevv]

Should OpenAI tests also run?

[thinkall]

LGTM. Thank you very much @glevv.

[thinkall]

Should OpenAI tests also run?

This will be triggered later when approved.

[glevv]

I'm not sure why OpenAI checks are failing.

[thinkall]

I'm not sure why OpenAI checks are failing.

@sonichi could you take a look at this? Thanks.

[Borda]

this is the main change; the rest is just apply pre-commit :)
ref: #1252 (comment)

[glevv]

I don't think it is possible to automerge without all the checks being green

[Borda]

I don't think it is possible to automerge without all the checks being green

That is right, but it seems that even all checks on mater are not green it seems some tests are flaky so this will need to wait until main branch is healthy =)

[Borda]

@sonichi @thinkall @jackgerrits how about adding this bot which would help with all this manual linitng?