fix: respect the ol start attribute

[TheOneWithTheBraid]

• adds support for the ol start attribute

Reference: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ol#start

[codecov[bot]]

Codecov Report

:x: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 64.13%. Comparing base (2814407) to head (4b9de9f). :warning: Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/processing/lists.dart	75.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1456      +/-   ##
==========================================
+ Coverage   64.08%   64.13%   +0.04%     
==========================================
  Files          39       39              
  Lines        3032     3036       +4     
==========================================
+ Hits         1943     1947       +4     
  Misses       1089     1089              

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