feat(pairwise): add pairwise operator

[hoc081098]

No description provided.

[codecov]

Codecov Report

Merging #102 (93efe74) into master (867226f) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
+ Coverage   81.99%   82.25%   +0.25%     
==========================================
  Files          24       25       +1     
  Lines         411      417       +6     
  Branches       65       67       +2     
==========================================
+ Hits          337      343       +6     
  Misses         54       54              
  Partials       20       20              

Impacted Files	Coverage Δ
...ommonMain/kotlin/com/hoc081098/flowext/pairwise.kt	100.00% <100.00%> (ø)

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