♻️ Refactor WSIReader.open

[shaneahmed]

• Move WSIReader.open and all try_* functions to factory.py
• WSIReader then imports lazily open_wsi from factory.py.
• Move all is_* functions to detection.py
• Move WSIReaderParams to types.py
• Move WSIReader staticmethods for validating image read to factory.py

[codecov]

Codecov Report

❌ Patch coverage is 98.90110% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.88%. Comparing base (2ee33aa) to head (6f8fa3d).

Files with missing lines	Patch %	Lines
tiatoolbox/wsicore/wsireader/detection.py	97.67%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1092   +/-   ##
========================================
  Coverage    99.88%   99.88%           
========================================
  Files           86       89    +3     
  Lines        11661    11675   +14     
  Branches      1531     1531           
========================================
+ Hits         11648    11662   +14     
  Misses           7        7           
  Partials         6        6           

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