Improve ICollection<> error checking

[viceroypenguin]

This PR adds additional ICollection<> and IList<> error checking for implementation methods. These methods should validate incoming arguments are valid. Many operators updated to address missing validation checks.

Fixes #460

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (933afe3) 91.40% compared to head (c16baf3) 91.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #462      +/-   ##
==========================================
+ Coverage   91.40%   91.42%   +0.01%     
==========================================
  Files         245      245              
  Lines        7916     7932      +16     
  Branches     1609     1609              
==========================================
+ Hits         7236     7252      +16     
  Misses        462      462              
  Partials      218      218              

Impacted Files	Coverage Δ
Source/SuperLinq/Insert.cs	100.00% <ø> (ø)
Source/SuperLinq/Sequence.cs	100.00% <ø> (ø)
Source/SuperLinq/AssertCount.cs	100.00% <100.00%> (ø)
Source/SuperLinq/CountDown.cs	100.00% <100.00%> (ø)
Source/SuperLinq/FillBackward.cs	98.00% <100.00%> (ø)
Source/SuperLinq/FillForward.cs	100.00% <100.00%> (ø)
...ator/SuperLinq.Generator.Generator/ZipLongest.g.cs	100.00% <100.00%> (ø)
...tor/SuperLinq.Generator.Generator/ZipShortest.g.cs	100.00% <100.00%> (ø)
Source/SuperLinq/Lag.cs	100.00% <100.00%> (ø)
Source/SuperLinq/Lead.cs	100.00% <100.00%> (ø)
... and 7 more

... and 1 file with indirect coverage changes

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