Polars

[percevalw]

Description

Added

• Support empty writer converter by default in edsnlp.data readers / writers (do not convert by default)
• Add support for polars data import / export

Checklist

• [x] If this PR is a bug fix, the bug is documented in the test suite.
• [x] Changes were documented in the changelog (pending section).
• [x] If necessary, changes were made to the documentation (eg new pipeline).

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.72727% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.06%. Comparing base (fe808e9) to head (e459021).

Files	Patch %	Lines
edsnlp/data/polars.py	97.72%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #270 +/- ## ======================================= Coverage 97.06% 97.06% ======================================= Files 255 256 +1 Lines 8618 8662 +44 ======================================= + Hits 8365 8408 +43 - Misses 253 254 +1 ```

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