Update type hints and organize import modules

[jrycw]

This PR, related to #312, is aimed at updating the type hints of our codebase using newer syntax. During this process, I believe it might be beneficial to organize the import modules using #119 isort.

I hope this PR will lay a solid foundation for us to adopt more advanced techniques of type hints in the future.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.61905% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 82.87%. Comparing base (b4f5ad9) to head (5c3fe2c).

Files	Patch %	Lines
great_tables/_options.py	66.66%	2 Missing :warning:
great_tables/_types.py	0.00%	2 Missing :warning:
great_tables/_body.py	50.00%	1 Missing :warning:
great_tables/_locations.py	90.90%	1 Missing :warning:
great_tables/_utils_render_html.py	90.90%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #315 +/- ## ========================================== - Coverage 82.89% 82.87% -0.02% ========================================== Files 41 41 Lines 4292 4287 -5 ========================================== - Hits 3558 3553 -5 Misses 734 734 ```

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[jrycw]

Well, it seems that even after adding from __future__ import annotations, Python 3.9 still doesn't like the | syntax.

[jrycw]

The Python 3.9 issue appears to be resolved by adding quotes to certain variables, as seen in 45b3f19.

[jrycw]

By the way, I've noticed that there are some modules imported in each section of _gt_data.py, and some of them are duplicated. Is this intentional, or can we organize all the modules at the top?

[machow]

Thanks so much for this giant cleanup PR!

By the way, I've noticed that there are some modules imported in each section of _gt_data.py, and some of them are duplicated. Is this intentional, or can we organize all the modules at the top?

I think we can organize at top now. Originally, that file was split into many pieces, and we moved it into one as a refactor, but didn't get to cleaning up redundant imports 😓.

Are you using a tool like isort or ruff's sorting to sort the imports?

In any event, if you're happy with the PR as is, I'm happy to review / merge! (Can always figure out using isort/ruff sorting after merging)

[jrycw]

@machow I've re-organized the import modules at the top for _gt_data.py. Could you please review/merge this PR?

Personally I've started using ruff to replace isort and black, which seems promising to me. However, there are many parameters that can be tweaked. For this PR, I manually ran isort for each file while editing, but please note that the final result may be affected by the pre-commit hook.

[jrycw]

Fix small pre-commit issues by 5c3fe2c.

[rich-iannone]

@machow this all looks great to me. If you wanted to merge @jrycw ‘s good work here, please feel free to do so!

[machow]

Sorry about the formatting issue in the merge commit, and thanks for all this helpful work!