♻️ REFACTOR: Move internal Rule/Delimiter to dataclass

[chrisjsewell]

In order to remove attr dependency

[codecov]

Codecov Report

Merging #211 (e82d06e) into master (063268b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #211   +/-   ##
=======================================
  Coverage   96.14%   96.14%           
=======================================
  Files          61       61           
  Lines        3242     3242           
=======================================
  Hits         3117     3117           
  Misses        125      125           

Flag	Coverage Δ
pytests	96.14% <100.00%> (ø)

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Impacted Files	Coverage Δ
markdown_it/ruler.py	89.65% <100.00%> (ø)
markdown_it/rules_inline/state_inline.py	97.89% <100.00%> (ø)

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