feat(rust): Support Serde for IRPlan

[ritchie46]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.92%. Comparing base (10aee35) to head (4e31af0).
Report is 46 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-plan/src/plans/ir/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18433   +/-   ##
=======================================
  Coverage   79.92%   79.92%           
=======================================
  Files        1496     1496           
  Lines      200190   200191    +1     
  Branches     2867     2867           
=======================================
+ Hits       159994   160002    +8     
+ Misses      39650    39643    -7     
  Partials      546      546           

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