refactor: use more py38 features

[jfcherng]

Use ruff and my brain to do some py38 refactoring.

Probably it's hard to review but in my test, LSP-copilot is still working.

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• Use "uv" to replace "pip" for performance
• Use "ruff" to replace "autoflake8/flake8/isort/black" for performance
• Use more py38 features

[jfcherng]

An issue is that, it will conflict with existing working branches/PRs.

[TerminalFi]

Tested, working.

LGTM