Add KtList.takeLast(n)

[passsy]

part of #71

[codecov]

Codecov Report

Merging #73 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #73      +/-   ##
=========================================
+ Coverage    99.7%   99.7%   +<.01%     
=========================================
  Files          40      40              
  Lines        1697    1709      +12     
=========================================
+ Hits         1692    1704      +12     
  Misses          5       5

Impacted Files	Coverage Δ
lib/src/collection/kt_list.dart	100% <ø> (ø)	⬆️
...src/collection/extension/list_extension_mixin.dart	100% <100%> (ø)	⬆️

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