refactor: Make list.to_struct and arr.to_struct serializable

[coastalwhite]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 72.36842% with 42 lines in your changes missing coverage. Please review.

Project coverage is 81.48%. Comparing base (f18436a) to head (a6fe7b4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-plan/src/utils.rs	30.76%	36 Missing ⚠️
...tes/polars-ops/src/chunked_array/list/to_struct.rs	75.00%	3 Missing ⚠️
...polars-plan/src/plans/aexpr/function_expr/array.rs	91.30%	2 Missing ⚠️
crates/polars-plan/src/dsl/function_expr/array.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23504      +/-   ##
==========================================
- Coverage   81.51%   81.48%   -0.03%     
==========================================
  Files        1635     1635              
  Lines      221685   221735      +50     
  Branches     2813     2813              
==========================================
- Hits       180708   180684      -24     
- Misses      40288    40362      +74     
  Partials      689      689              

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