feat: add 'marker:' variant

[Techassi]

This PR adds the marker: variant.

Reference

• https://tailwindcss.com/docs/hover-focus-and-other-states#list-markers

[codecov-commenter]

Codecov Report

Merging #635 (a2b04a2) into main (9529357) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #635   +/-   ##
=======================================
  Coverage   88.16%   88.16%           
=======================================
  Files          57       57           
  Lines        4859     4860    +1     
  Branches     1034     1034           
=======================================
+ Hits         4284     4285    +1     
  Misses        311      311           
  Partials      264      264           

Impacted Files	Coverage Δ
src/config/order.ts	100.00% <ø> (ø)
src/lib/variants/state.ts	100.00% <100.00%> (ø)

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