Update conditions for apply_sort fast codepath

[charlesbluca]

With ascending and na_position support now working for both Dask and Dask-cuDF, we can now use the fast apply_sort codepath for:

• All single column sorts (CPU and GPU)
• Multi-column sorts where sort_ascending and sort_null_first are homogeneous lists (GPU only)

[codecov-commenter]

Codecov Report

Merging #337 (967eafc) into main (96524ee) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
+ Coverage   95.69%   95.76%   +0.07%     
==========================================
  Files          65       65              
  Lines        2854     2856       +2     
  Branches      534      534              
==========================================
+ Hits         2731     2735       +4     
+ Misses         75       73       -2     
  Partials       48       48              

Impacted Files	Coverage Δ
dask_sql/physical/utils/sort.py	90.62% <100.00%> (+7.29%)	⬆️

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