feat(python): More ergonomic sort args

[stinodego]

Partially addresses #6451

Update docstrings and type hints for the following methods:

• DataFrame.sort
• LazyFrame.sort
• Series.sort
• Expr.sort
• Expr.sort_by
• Series.arr.sort
• Expr.arr.sort

Other changes:

• Dispatch DataFrame.sort to LazyFrame.sort
• Clean up argument parsing logic
• Add *args option for DataFrame/Lazyframe.sort and Expr.sort_by + add some tests
• Make reverse keyword-only everywhere (using the deprecation util)
• Raise an error when nulls_last is supplied while sorting by multiple arguments