Now raising an error if color or table doesn't exist

[timtreis]

Now raising errors on missing input and if no table at all annotates the element.

In the process, I noticed we sometimes warn from our logger and sometimes from warnings, so I got rid of warnings. Then, I had to adjust the capturing of the logged messages, so I added that helper as well.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 74.57627% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.33%. Comparing base (17df374) to head (adcb9a5).

Files with missing lines	Patch %	Lines
src/spatialdata_plot/pl/render.py	53.12%	15 Missing ⚠️
src/spatialdata_plot/pl/utils.py	79.68%	13 Missing ⚠️
src/spatialdata_plot/_logging.py	90.90%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
- Coverage   83.88%   83.33%   -0.56%     
==========================================
  Files           8        8              
  Lines        2259     2322      +63     
==========================================
+ Hits         1895     1935      +40     
- Misses        364      387      +23     

Files with missing lines	Coverage Δ
src/spatialdata_plot/_logging.py	91.66% <90.90%> (-1.20%)	⬇️
src/spatialdata_plot/pl/utils.py	79.52% <79.68%> (-0.04%)	⬇️
src/spatialdata_plot/pl/render.py	88.57% <53.12%> (-2.77%)	⬇️

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[timtreis]

@LucaMarconato I assume this will have implications in our tutorials if we're blindly plotting elements that are not annotated.