add image caption

[vaniisgh]

adds a caption kwarg as req in #5437 . Though it doesn't accept alignment from user yet.

[vaniisgh]

would I be required to squash the commits ? @philippjfr

[hoxbro]

would I be required to squash the commits ?

No, this will be done automatically when we merge this PR into the main branch.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6bb6aeb) 84.64% compared to head (b7773f6) 83.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6003      +/-   ##
==========================================
- Coverage   84.64%   83.09%   -1.56%     
==========================================
  Files         291      291              
  Lines       43546    43554       +8     
==========================================
- Hits        36859    36190     -669     
- Misses       6687     7364     +677     

Flag	Coverage Δ
ui-tests	38.33% <37.50%> (-2.42%)	⬇️
unitexamples-tests	72.75% <100.00%> (-0.03%)	⬇️

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[philippjfr]

Thank you so much! Happy to merge this without the caption alignment options. However it would be really great if you could add caption to the Parameters section in the following notebooks:

• examples/reference/panes/Image.ipynb
• examples/reference/panes/PNG.ipynb
• examples/reference/panes/JPEG.ipynb
• examples/reference/panes/SVG.ipynb

[philippjfr]

Thanks so much for your contribution! I'll merge and add the docs separately.