docs: Update datatype mapping for polars Dataframe and LazyFrame

[HansBambel]

Why are the changes needed?

People using polars instead of pandas are afraid that their workflow will not work with Flyte when the documentation does not mention Polars at all.

What changes were proposed in this pull request?

Adding polars.DataFrame and polars.LazyFrame to the data type mapping documentation to show that these are supported.
https://docs.flyte.org/en/latest/user_guide/data_types_and_io/index.html

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

flyteorg/flytekit#2695 (comment)

Docs link

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.99%. Comparing base (e21a6ad) to head (5b43fe4).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6109   +/-   ##
=======================================
  Coverage   36.98%   36.99%           
=======================================
  Files        1318     1318           
  Lines      132449   132449           
=======================================
+ Hits        48984    48994   +10     
+ Misses      79212    79202   -10     
  Partials     4253     4253           

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.06% <ø> (+0.02%)	⬆️
unittests-flytecopilot	30.99% <ø> (ø)
unittests-flytectl	62.33% <ø> (+0.04%)	⬆️
unittests-flyteidl	7.23% <ø> (ø)
unittests-flyteplugins	53.85% <ø> (ø)
unittests-flytepropeller	42.60% <ø> (ø)
unittests-flytestdlib	55.18% <ø> (ø)

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[eapolinario]

I confirmed that polars shows up in the table in https://flyte--6109.org.readthedocs.build/en/6109/user_guide/data_types_and_io/index.html.

Thank you!

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