Split read gathering methods into a separate module

[creisle]

• Move read evidence gathering methods off of the Evidence class into their own module to avoid super long files and simplify the code a bit in prep for long read changes

NOTE: no actual function changes, just moved methods

[codecov[bot]]

Codecov Report

Merging #328 (ad56ca3) into develop_v3 (9e64e59) will increase coverage by 0.03%. The diff coverage is 83.97%.

@@              Coverage Diff               @@
##           develop_v3     #328      +/-   ##
==============================================
+ Coverage       86.43%   86.47%   +0.03%     
==============================================
  Files              55       56       +1     
  Lines            9306     9315       +9     
  Branches         2404     2404              
==============================================
+ Hits             8044     8055      +11     
+ Misses            779      778       -1     
+ Partials          483      482       -1     

Flag	Coverage Δ
unittests	86.47% <83.97%> (+0.03%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/mavis/validate/base.py	78.07% <ø> (-3.02%)	:arrow_down:
src/mavis/validate/gather.py	83.88% <83.88%> (ø)
src/mavis/validate/main.py	90.53% <100.00%> (+0.05%)	:arrow_up:
src/mavis/breakpoint.py	91.26% <0.00%> (+0.64%)	:arrow_up:

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