Fix slowsort comparable

[fredaesiofori]

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Fixes #15234

Update sorts/slowsort.py to support generic comparable types (such as strings and floating-point numbers) instead of integers only.

• Implemented Comparable protocol using typing.Protocol and parameterized with TypeVar.
• Updated function type annotations to list[T].
• Added in-place doctests for string and float sequences.

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[fredaesiofori]

Fixes #15234