Allow multiple alignment values for colorbar texts

[has2k1]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 76.19048% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.73%. Comparing base (345f3c2) to head (0da5f04).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
plotnine/guides/guide.py	70.58%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1011      +/-   ##
==========================================
- Coverage   86.75%   86.73%   -0.02%     
==========================================
  Files         198      198              
  Lines       13228    13246      +18     
  Branches     1649     1653       +4     
==========================================
+ Hits        11476    11489      +13     
- Misses       1205     1208       +3     
- Partials      547      549       +2     

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