refactor: use native types and f-string

[jfcherng]

With from __future__ import annotations, in type annotations we can convert

• Type =====> type
• List =====> list
• Tuple =====> tuple
• Dict =====> dict
• Set =====> set
• Optional =====> None
• Union =====> |

Py38 new feature(s):

• str.format =====> f-string

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Not Done in this PR

By the way, we can upgrade flake8 to v7. We previously stayed at v5 because it won't complaint about unused imports, which is used in # type: .... Or, let's go ruff as linter/formatter (this is the setup for all my Python projects now 😄 ).

[jfcherng]

Okay, now there are only line length issues left.

[predragnikolic]

please ignore the failing CI, the test_did_change_before_did_close is a flaky test, we track it here -> https://github.com/sublimelsp/LSP/issues/2461

[predragnikolic]

Thanks for the changes

I'll merge this tomorrow