Add plot_annotation for compositions

[has2k1]

closes #966

[codecov]

Codecov Report

❌ Patch coverage is 91.71123% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.77%. Comparing base (598ba56) to head (ad619f9).

Files with missing lines	Patch %	Lines
...ine/_mpl/layout_manager/_composition_side_space.py	89.10%	22 Missing ⚠️
plotnine/_mpl/layout_manager/_layout_tree.py	77.77%	14 Missing ⚠️
plotnine/_mpl/utils.py	89.28%	8 Missing and 1 partial ⚠️
plotnine/composition/_compose.py	93.87%	4 Missing and 2 partials ⚠️
...e/_mpl/layout_manager/_composition_layout_items.py	90.69%	2 Missing and 2 partials ⚠️
plotnine/_mpl/layout_manager/_side_space.py	92.68%	2 Missing and 1 partial ⚠️
plotnine/_mpl/layout_manager/_plot_side_space.py	97.75%	2 Missing ⚠️
plotnine/composition/_plot_annotation.py	93.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1002      +/-   ##
==========================================
+ Coverage   86.75%   86.77%   +0.01%     
==========================================
  Files         198      202       +4     
  Lines       13264    13614     +350     
  Branches     1650     1675      +25     
==========================================
+ Hits        11507    11813     +306     
- Misses       1214     1257      +43     
- Partials      543      544       +1     

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