Add new SourceKind: Collection and List and use it for EndsWith tests.

[Orace]

Fix for #676/EndsWith.

This is WIP, I'm not happy on how all Sequence/Collection/List cases are built.
I didn't find yet a nice way to mix TestCase and Values NUnit attributes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.52%. Comparing base (283c44c) to head (ff7d5dc).
⚠️ Report is 128 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #960   +/-   ##
=======================================
  Coverage   92.52%   92.52%           
=======================================
  Files         113      113           
  Lines        3440     3440           
  Branches     1024     1024           
=======================================
  Hits         3183     3183           
  Misses        192      192           
  Partials       65       65           

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[atifaziz]

This is WIP

I've converted this PR to a draft.