👌 IMPROVE: Add bullet attribute to bullet_list node

[chrisjsewell]

This brings it inline with the AST produced by RST

[codecov]

Codecov Report

Merging #465 (a3fa8a9) into master (11fb239) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #465   +/-   ##
=======================================
  Coverage   90.29%   90.30%           
=======================================
  Files          16       16           
  Lines        1989     1991    +2     
=======================================
+ Hits         1796     1798    +2     
  Misses        193      193           

Flag	Coverage Δ
pytests	90.30% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
myst_parser/docutils_renderer.py	92.85% <100.00%> (+0.02%)	⬆️

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