refactor: Move storage of hive partitions to DataFrame

[coastalwhite]

This makes it so that Hive Partitions are stored in a DataFrame. This is going to allow for much more efficient evaluation of the predicates.

[codecov]

Codecov Report

Attention: Patch coverage is 96.73913% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.90%. Comparing base (d2a6b8b) to head (082a535).
Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-mem-engine/src/planner/lp.rs	66.66%	1 Missing ⚠️
crates/polars-plan/src/plans/hive.rs	98.27%	1 Missing ⚠️
crates/polars-stream/src/physical_plan/fmt.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #21364   +/-   ##
=======================================
  Coverage   79.90%   79.90%           
=======================================
  Files        1597     1597           
  Lines      228699   228713   +14     
  Branches     2618     2618           
=======================================
+ Hits       182746   182763   +17     
+ Misses      45354    45351    -3     
  Partials      599      599           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.