Polars: added polars selector ends-with

[ayax79]

Release notes summary - What our users need to know

Introduces polars selector ends-with allowing columns to be selected by a suffix:

  > {
        "foo": ["x", "y"],
        "bar": [123, 456],
        "baz": [2.0, 5.5],
        "zap": [false, true],
    } |
    polars into-df --as-columns |
    polars select (polars selector ends-with z) |
    polars sort-by baz |
    polars collect
  ╭───┬──────╮
  │ # │ baz  │
  ├───┼──────┤
  │ 0 │ 2.00 │
  │ 1 │ 5.50 │
  ╰───┴──────╯

This is is part of an effort to add selectors available in the python API.