Adding ability to change channel once loaded and also handle curve data

[ahobbs7]

When a file is loaded into napari, a widget will now be added to the dock on the right allowing the channel to be changed.
Furthermore, the addition of the get available channels function in AFMReader allows us to cut the weird log capturing code to get available channels and just use the function.
The update also allows the handling of curve data passed from .jpk-qi-data.

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Before submitting a Pull Request please check the following.

• Existing tests pass.
• Documentation has been updated and builds.
• Pre-commit checks pass.
• New functions/methods have typehints and docstrings.
• New functions/methods have tests which check the intended behaviour is correct.

[codecov]

Codecov Report

❌ Patch coverage is 61.13208% with 103 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.45%. Comparing base (6ebdf6c) to head (5e21a4c).

Files with missing lines	Patch %	Lines
napari-afmreader/src/napari_afmreader/_reader.py	52.83%	100 Missing ⚠️
napari-afmreader/src/napari_afmreader/_alerts.py	91.89%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #39       +/-   ##
===========================================
- Coverage   98.93%   66.45%   -32.48%     
===========================================
  Files           3        4        +1     
  Lines          94      319      +225     
===========================================
+ Hits           93      212      +119     
- Misses          1      107      +106     

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