420 polars avro reader writer

[ghost]

Polars Avro Data Saver /Loader.

Implement https://pola-rs.github.io/polars/py-polars/html/reference/io.html#avro as a data saver/loader

Changes

• Implement the reader and writer for Avro
• Add unit tests
• Add the materialize example

How I tested this

• Added the unit tests for the implemented functionality

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[skrawcz]

@kokobhara you'll need to rebase this pull request.

IIRC the steps to this are:

1. Pull the latest to your fork.
2. Rebase this branch against your fork's main.
3. Fix any conflicts & verify that things still work.
4. Force push it.

Otherwise looks good, thanks!