feat: upgrade datafusion to 44.0

[westonpace]

I wanted to upgrade to 44 to check and see if the string sorting bug was fixed. It wasn't. However, it might still be useful to commit this since we'll need to upgrade at some point.

[westonpace]

Hmm, seems this introduces some legitimate test failures. I'll need to investigate further.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 27 lines in your changes missing coverage. Please review.

Project coverage is 78.50%. Comparing base (2142594) to head (789d482).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance-datafusion/src/exec.rs	56.25%	7 Missing ⚠️
rust/lance/src/dataset/scanner.rs	80.00%	2 Missing and 4 partials ⚠️
rust/lance-datafusion/src/substrait.rs	44.44%	4 Missing and 1 partial ⚠️
rust/lance/src/datafusion/dataframe.rs	0.00%	5 Missing ⚠️
rust/lance/src/dataset/write/merge_insert.rs	93.47%	0 Missing and 3 partials ⚠️
rust/lance-datafusion/src/planner.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3341      +/-   ##
==========================================
+ Coverage   78.44%   78.50%   +0.06%     
==========================================
  Files         250      250              
  Lines       90141    90193      +52     
  Branches    90141    90193      +52     
==========================================
+ Hits        70710    70806      +96     
+ Misses      16509    16479      -30     
+ Partials     2922     2908      -14     

Flag	Coverage Δ
unittests	78.50% <80.00%> (+0.06%)	⬆️

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