Refactor and generalize overlap-exon-intron-boundary?

[federkasten]

I have made some updates to the #92. Specifically, I have refactored and generalized the 'overlap-exon-intron-boundary?' function using diff-bases and added tests.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0587070) 46.79% compared to head (7e227e8) 46.93%.

Files	Patch %	Lines
src/varity/vcf_to_hgvs/protein.clj	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                                 Coverage Diff                                  @@
##           fix/fix-exon-intron-overlap-and-ini-site-variant      #93      +/-   ##
====================================================================================
+ Coverage                                             46.79%   46.93%   +0.14%     
====================================================================================
  Files                                                    16       16              
  Lines                                                  2122     2124       +2     
  Branches                                                 72       71       -1     
====================================================================================
+ Hits                                                    993      997       +4     
+ Misses                                                 1057     1056       -1     
+ Partials                                                 72       71       -1     

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[nokara26]

LGTM!