Add polyfills for Enum.Parse<T>(string, [bool]), Enum.GetValue<T>() and Enum.GetNames<T>()

[Tyrrrz]

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[Copilot]

Pull request overview

This PR adds polyfills for generic Enum methods (Parse<T>, GetNames<T>, and GetValues<T>) to provide compatibility with older .NET versions.

• Implements Enum.Parse<T>(string) and Enum.Parse<T>(string, bool) for .NET Core 2.0
• Implements Enum.GetNames<T>() and Enum.GetValues<T>() for .NET 5.0
• Adds comprehensive test coverage for Parse methods and partial coverage for GetNames

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
PolyShim/Signatures.md	Updates documentation with 4 new Enum methods and increments total counts accordingly
PolyShim/NetCore20/Enum.cs	Implements generic Parse methods that delegate to non-generic Enum.Parse with typeof(T)
PolyShim/Net50/Enum.cs	Implements generic GetNames and GetValues methods that delegate to non-generic versions
PolyShim.Tests/NetCore20/EnumTests.cs	Adds comprehensive tests for Parse methods including error cases
PolyShim.Tests/Net50/EnumTests.cs	Adds test for GetNames method

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (8e70b97) to head (bf6bac9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

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##   master   #56   +/-   ##
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