fix: Fix struct literals

[ritchie46]

Also make AnyValue -> Literal infallible.

fixes #19204

[codecov]

Codecov Report

Attention: Patch coverage is 75.75758% with 8 lines in your changes missing coverage. Please review.

Project coverage is 79.68%. Comparing base (207ddb0) to head (7077936).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-plan/src/plans/lit.rs	74.07%	7 Missing ⚠️
...ars-plan/src/plans/conversion/type_coercion/mod.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19214   +/-   ##
=======================================
  Coverage   79.67%   79.68%           
=======================================
  Files        1532     1532           
  Lines      209190   209185    -5     
  Branches     2415     2415           
=======================================
+ Hits       166677   166690   +13     
+ Misses      41967    41949   -18     
  Partials      546      546           

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[alexander-beedie]

Also make AnyValue -> Literal infallible.

PopeLiteralValue¹ :)

Footnotes

1. https://en.wikipedia.org/wiki/Papal_infallibility ↩