Use DynComparator for lexsort and partition

[yjshen]

This PR is a follow-up of #414 to make LexicographicalPartitionIterator Send + Sync, and feasible to use across .await.

[codecov]

Codecov Report

Merging #637 (ee97af4) into main (e8279a4) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #637      +/-   ##
==========================================
+ Coverage   69.92%   69.93%   +0.01%     
==========================================
  Files         299      299              
  Lines       16627    16625       -2     
==========================================
+ Hits        11626    11627       +1     
+ Misses       5001     4998       -3     

Impacted Files	Coverage Δ
src/compute/sort/mod.rs	26.19% <ø> (ø)
src/compute/partition.rs	100.00% <100.00%> (+8.57%)	⬆️
src/compute/sort/lex_sort.rs	66.66% <100.00%> (+0.45%)	⬆️
src/io/parquet/read/nested_utils.rs	77.45% <0.00%> (-0.99%)	⬇️
src/bitmap/utils/slice_iterator.rs	92.53% <0.00%> (+1.49%)	⬆️

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