potential solution for skipping sort

[donaldcampbelljr]

@ClaudeHu try this branch and see if it:
a. shortens time significantly,
b. provides the same answer for your presorted bed files

The original C++ implementation of uniwig does sort the starts and ends in memory regardless of the sort flag being set.

[codecov]

Codecov Report

Attention: Patch coverage is 51.85185% with 13 lines in your changes missing coverage. Please review.

Project coverage is 61.20%. Comparing base (df443c2) to head (05dc754).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
gtars/src/uniwig/cli.rs	0.00%	7 Missing ⚠️
gtars/src/uniwig/mod.rs	33.33%	4 Missing ⚠️
gtars/src/uniwig/utils.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   61.27%   61.20%   -0.08%     
==========================================
  Files          37       37              
  Lines        6102     6119      +17     
==========================================
+ Hits         3739     3745       +6     
- Misses       2363     2374      +11     

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