fix: include the list item field schema

[westonpace]

closes #2947

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.99%. Comparing base (75aa2c2) to head (17a6690).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance-encoding/src/encodings/logical/list.rs	93.75%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2950      +/-   ##
==========================================
+ Coverage   78.52%   78.99%   +0.46%     
==========================================
  Files         232      234       +2     
  Lines       70911    72810    +1899     
  Branches    70911    72810    +1899     
==========================================
+ Hits        55681    57514    +1833     
- Misses      12283    12330      +47     
- Partials     2947     2966      +19     

Flag	Coverage Δ
unittests	78.99% <94.11%> (+0.46%)	⬆️

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