Matthias Meschede 53d30ee7ea
add polars str strip chars (with --end / --start options) (#15118)
# Description

This PR adds `polars str-strip-chars-end`

# User-Facing Changes

New function that can be used as follows:

```
~/Projects/nushell> [[text]; [hello!!!] [world!!!]] | polars into-df | polars select (polars col text | polars str-strip-chars-end "!") | polars collect
╭───┬───────╮
│ # │ text  │
├───┼───────┤
│ 0 │ hello │
│ 1 │ world │
╰───┴───────╯
```

# Tests + Formatting

tests ran locally.
I ran the formatter.

# After Submitting
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2025-02-25 15:37:52 -08:00
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