Removes all logic from interfaces

[passsy]

Implementer have to implement them anyhow

[codecov]

Codecov Report

Merging #13 into master will increase coverage by 0.09%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   54.88%   54.98%   +0.09%     
==========================================
  Files          27       24       -3     
  Lines        1135     1133       -2     
==========================================
  Hits          623      623              
+ Misses        512      510       -2

Impacted Files	Coverage Δ
lib/src/collection/map.dart	69.04% <0%> (-3.46%)	⬇️

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[codecov]

Codecov Report

Merging #13 into master will increase coverage by 0.71%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #13      +/-   ##
=========================================
+ Coverage   54.88%   55.6%   +0.71%     
=========================================
  Files          27      24       -3     
  Lines        1135    1133       -2     
=========================================
+ Hits          623     630       +7     
+ Misses        512     503       -9

Impacted Files	Coverage Δ
lib/src/collection/map.dart	73.8% <100%> (+1.3%)	⬆️
lib/src/extension/iterable_extension_mixin.dart	47.61% <0%> (+1.03%)	⬆️

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