refactor(rust): Move IO-related options structs to polars-io

[stinodego]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.40%. Comparing base (0c37ead) to head (98a7eb1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15806   +/-   ##
=======================================
  Coverage   80.39%   80.40%           
=======================================
  Files        1264     1264           
  Lines      165421   165423    +2     
=======================================
+ Hits       132994   133002    +8     
+ Misses      32427    32421    -6     

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[codspeed-hq]

CodSpeed Performance Report

Merging #15806 will not alter performance

_{Comparing io-options (98a7eb1) with main (937fd46)}

Summary

✅ 22 untouched benchmarks

[ritchie46]

Is it breaking Rust though? They should still be importable via polars right? As in the structs don't change and they are still available via public imports. (polars-plan isn't meant as public).

[stinodego]

If we only consider the polars crate public, this isn't breaking. I removed the tag!