perf: add marks dot classname

[howiepu]

I need to do something special with the dot for marks, but I don't have a class name for marks, so I think it's worth adding that.

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Name	Status	Preview	Comments	Updated (UTC)
slider	❌ Failed (Inspect)			Apr 20, 2023 8:44am

[codecov[bot]]

Codecov Report

Merging #842 (fb86e14) into master (5924005) will increase coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head fb86e14 differs from pull request most recent head 7a3fe19. Consider uploading reports for the commit 7a3fe19 to get more accurate results

@@           Coverage Diff           @@
##           master     #842   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          13       13           
  Lines         535      540    +5     
  Branches      147      150    +3     
=======================================
+ Hits          534      539    +5     
  Misses          1        1           

Impacted Files	Coverage Δ
src/context.ts	100.00% <ø> (ø)
src/Handles/Handle.tsx	100.00% <100.00%> (ø)
src/Slider.tsx	100.00% <100.00%> (ø)
src/Steps/Dot.tsx	100.00% <100.00%> (ø)
src/Steps/index.tsx	100.00% <100.00%> (ø)

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[yoyo837]

Docs and test case please.

[MadCcc]

Prefer to have classNames: { markedDot: string } for Slider, not to add className by default. Then you can use like this:

<Slider classNames={{ markedDot: 'custom-dot' }} />