🔨 Add mypy Type Check to stainnorm, stainaugment, patchextraction

[Jiaqi-Lv]

Adds mypy checks to

• tools/stainnorm.py
• tools/stainaugment.py
• tools/patchextraction.py

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.89%. Comparing base (ce348e7) to head (b297067).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #787   +/-   ##
========================================
  Coverage    99.89%   99.89%           
========================================
  Files           69       69           
  Lines         8534     8574   +40     
  Branches      1641     1641           
========================================
+ Hits          8525     8565   +40     
  Misses           1        1           
  Partials         8        8           

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[shaneahmed]

@Jiaqi-Lv Please keep an eye on #786 as there might be a few conflicts.

[shaneahmed]

Thanks @Jiaqi-Lv