Add `CopyTo` Operator

[viceroypenguin]

Add a CopyTo operator to replicate the behavior of List<>.CopyTo or Array.CopyTo, with enumerable semantics.

NB: See https://github.com/viceroypenguin/SuperLinq/blob/master/Source/SuperLinq/CopyTo.cs for implementation

[mohamedabotir]

can you explain more

[viceroypenguin]

@mohamedabotir Please see the PR #964 for more details.