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Add polyfil for Enumerable.Prepend for net46X and net47 framework targets #543

Description

@JR-Morgan

Feature request

Enumerable.Prepend is available natively in .NET Standard2.0, Framework 4.7.1, and .NET Core 1.0 (and greater)

But it is not available in in net461, net462, net47

A polyfil for Enumerable.Append was already added by #10, however, there isn't currently one for prepend.
Meaning this function is not available in the aforementioned targets.

Describe the solution

Code reference for System.Linq is available, and is implemented with prepend iterators:
https://github.com/dotnet/runtime/blob/main/src/libraries/System.Linq/src/System/Linq/AppendPrepend.cs

Alternatively, a simpler yield based could be used like implemented in #10. But I'm unsure how this performs compared to the native Linq implementation.

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