🆕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 96.14512% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.24%. Comparing base (78b797e) to head (86c8fe9).

Files with missing lines	Patch %	Lines
tiatoolbox/wsicore/wsireader.py	96.73%	3 Missing and 6 partials ⚠️
tiatoolbox/visualization/bokeh_app/main.py	92.59%	1 Missing and 3 partials ⚠️
tiatoolbox/models/dataset/classification.py	93.75%	2 Missing ⚠️
tiatoolbox/visualization/tileserver.py	92.30%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #825      +/-   ##
===========================================
- Coverage    99.37%   99.24%   -0.14%     
===========================================
  Files           71       72       +1     
  Lines         9175     9536     +361     
  Branches      1197     1266      +69     
===========================================
+ Hits          9118     9464     +346     
- Misses          31       35       +4     
- Partials        26       37      +11     

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