🆕Multichannel Image Reading

[measty]

Initial draft implementation of multi-channel reading.

Still needs lots of work so its a draft at the moment.

to do:

• test on other examples
• unit tests
• decide what should default behaviour be?
• decide how will interact with VirtualWSIReader mode flag - should we extend this to all readers?
• are there better ways to do RGB conversion? simple approach at the moment
• Get colors from metadata (if existing)
• Selecting specific channels in viewer
• Third set of metadata format for COMET
• For usability join the menus for channel and colour (so not scrolling separately)

[codecov]

Codecov Report

❌ Patch coverage is 82.21709% with 77 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.92%. Comparing base (d5c1995) to head (ed99162).

Files with missing lines	Patch %	Lines
tiatoolbox/utils/postproc_defs.py	52.72%	19 Missing and 7 partials ⚠️
tiatoolbox/visualization/bokeh_app/main.py	66.66%	16 Missing and 2 partials ⚠️
tiatoolbox/visualization/tileserver.py	34.61%	16 Missing and 1 partial ⚠️
tiatoolbox/wsicore/wsireader.py	94.71%	3 Missing and 11 partials ⚠️
tiatoolbox/models/dataset/classification.py	93.75%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #825      +/-   ##
===========================================
- Coverage    99.70%   98.92%   -0.78%     
===========================================
  Files           71       72       +1     
  Lines         9141     9498     +357     
  Branches      1190     1260      +70     
===========================================
+ Hits          9114     9396     +282     
- Misses          23       77      +54     
- Partials         4       25      +21     

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