typing: bound recursive quick sort to Comparable protocol

[Silverbullets1]

Describe your change

• Add or change doctests?

Checklist

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
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---

Part of #15234 (the recursive_quick_sort.py checkbox).

This PR types the recursive quick sort for any comparable items:

• Replaced the implicit Any element type with the Comparable Protocol + TypeVar bound (quick_sort[T: Comparable](data: list[T]) -> list[T]), matching the pattern already checked in for other sorts in this issue (e.g. bogo_sort).
• Partitioning now relies only on __lt__: not data[0] < e for the left partition and data[0] < e for the right, replacing the former mix of <= and >.
• New doctests: strings sort, floats and ints mix sorts, and quick_sort([1, "a"]) raises TypeError.
• recursive_quick_sort joins the shared battery in tests/test_sorts.py: it is added to both test_sort_matches_builtin (all existing cases) and test_sort_rejects_non_comparable_items, plus a dedicated test_recursive_quick_sort_mixed_types.

Verification:

$ uvx ruff check sorts/recursive_quick_sort.py tests/test_sorts.py
All checks passed!

$ python -m pytest tests/test_sorts.py -q --no-header
444 passed in 0.37s

$ python -m pytest --doctest-modules sorts/recursive_quick_sort.py -q --no-header
1 passed in 0.02s

Best,
Sam | Lead Engineer
DevilX Digital Labs
https://devilx-solution.vercel.app/