Scrollable refactor

[yairEO]

Scrollable

• Added state which is used as the context's value which now includes scrollTop & scrollLeft data
• Removed refs for the tracks which were introduced in the previous release in favor of using context data to update css variables on the scrollbars accordingly
• CSS refactor - DRY
• Added CSS variables:
  • track-thickness
  • scrollable-thumb-thickness
  • scrollable-thumb-offset

[codecov[bot]]

Codecov Report

Merging #73 (6144dd1) into master (0655ac7) will increase coverage by 0.22%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   95.77%   96.00%   +0.22%     
==========================================
  Files          61       61              
  Lines         853      852       -1     
  Branches       30       29       -1     
==========================================
+ Hits          817      818       +1     
  Misses         33       33              
+ Partials        3        1       -2     

Impacted Files	Coverage Δ
src/components/Scrollable/Scrollable.constants.js	100.00% <ø> (ø)
src/components/Scrollable/Scrollable.jsx	100.00% <100.00%> (ø)
...onents/HorizontalScrollbar/HorizontalScrollbar.jsx	100.00% <100.00%> (+5.88%)	:arrow_up:
...components/VerticalScrollbar/VerticalScrollbar.jsx	100.00% <100.00%> (+5.88%)	:arrow_up:

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[udia76]

:tada: This PR is included in version 1.5.9 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: