feat(list): Implement getAttributeForElementIndex

[ghost]

fixes #822

[codecov-io]

Codecov Report

Merging #948 into rc0.14.0 will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           rc0.14.0     #948      +/-   ##
============================================
+ Coverage     94.12%   94.12%   +<.01%     
============================================
  Files            86       86              
  Lines          3644     3645       +1     
  Branches        576      576              
============================================
+ Hits           3430     3431       +1     
  Misses           90       90              
  Partials        124      124

Impacted Files	Coverage Δ
packages/list/index.tsx	94.82% <100%> (+0.02%)	⬆️

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