fix: bugs in list codec when dealing with a list of empty lists or multiple lists in a single page

[westonpace]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.95973% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 81.17%. Comparing base (bc89dcb) to head (ef927b0).

Files	Patch %	Lines
rust/lance-encoding/src/testing.rs	93.30%	11 Missing and 3 partials :warning:
rust/lance-encoding/src/encodings/logical/list.rs	93.93%	2 Missing and 2 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2222      +/-   ##
==========================================
+ Coverage   81.15%   81.17%   +0.01%     
==========================================
  Files         185      185              
  Lines       53508    53641     +133     
  Branches    53508    53641     +133     
==========================================
+ Hits        43425    43543     +118     
- Misses       7609     7620      +11     
- Partials     2474     2478       +4     

Flag	Coverage Δ
unittests	81.17% <93.95%> (+0.01%)	:arrow_up:

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