Do: ICollection<> implementation

[viceroypenguin]

This PR adds an ICollection<> implementation of the Do and Pipe operators.

Fixes #381
Fixes #382

[codecov]

Codecov Report

Patch coverage: 96.96% and project coverage change: -0.01 ⚠️

Comparison is base (94644cc) 87.42% compared to head (556e8c1) 87.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
- Coverage   87.42%   87.42%   -0.01%     
==========================================
  Files         239      239              
  Lines        7175     7189      +14     
  Branches     1672     1675       +3     
==========================================
+ Hits         6273     6285      +12     
- Misses        462      463       +1     
- Partials      440      441       +1     

Impacted Files	Coverage Δ
Source/SuperLinq/Do.cs	97.67% <96.87%> (-2.33%)	⬇️
Source/SuperLinq/Pipe.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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