Implement new API GetEnumValuesAsUnderlyingType

[LakshanF]

Fixes #72498,

• Implemented the new API in Type and the two static API's in Enum calling the Type implementation. The abstract Type implementation throws with the expectation that a derived runtime Type will provide its own implementation.
• CoreCLR/Mono has an override implementation and NativeAOT has its own implementation that mirrors the original PR Make Enum.GetValues AOT-safe #72236.
• Also added an override in MetadataAssemblyLoadContext that is reflection friendly
• Added some test scenarios with the most on EnumTests

[dotnet-issue-labeler]

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This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, to please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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Issue Details

---

Fixes #72498,

• Implemented the new API in Type and the two static API's in Enum calling the Type implementation
• CoreCLR/Mono has an override implementation and NativeAOT has its own implementation that mirrors the original PR Make Enum.GetValues AOT-safe #72236
• Also added an override in MetadataAssemblyLoadContext that is reflection friendly
• Added some test scenarios with the most on EnumTests

Author:	LakshanF
Assignees:	-
Labels:	area-System.Reflection, new-api-needs-documentation, CoreClr
Milestone:	-

[eerhardt]

Can you also change the upstack code to use this? That way we can ensure it is working correctly?

Ex.

runtime/src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/EnumConverter.cs

Lines 174 to 179 in 20b42d5

	Array objValues = Enum.GetValues(EnumType);
	long[] ulValues = new long[objValues.Length];
	for (int idx = 0; idx < objValues.Length; idx++)
	{
	ulValues[idx] = GetEnumValue(isUnderlyingTypeUInt64, (Enum)objValues.GetValue(idx)!, culture);
	}

[jkotas]

LGTM. Thank you!

[jkotas]

Thanks