[NativeAOT] Implement support for `UnsafeAccessorAttribute`

[vitek-karas]

Implement #81741 for NativeAOT.

• Implement the stub generation for the extern methods - [CoreCLR/NativeAOT] UnsafeAccessorAttribute non-generic support #86932
• Add tests - or make sure we can run the tests added in CoreCLR using NativeAOT - [CoreCLR/NativeAOT] UnsafeAccessorAttribute non-generic support #86932
• There's probably no need for direct trimming work - so just make sure that the trimming tests added for illink also run on NativeAOT

See #86161 for CoreCLR support

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Issue Details

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Implement #81741 for NativeAOT.

• Implement the stub generation for the extern methods
• Add tests - or make sure we can run the tests added in CoreCLR using NativeAOT
• There's probably no need for direct trimming work - so just make sure that the trimming tests added for illink also run on NativeAOT

See #86161 for CoreCLR support

Author:	vitek-karas
Assignees:	-
Labels:	area-NativeAOT-coreclr
Milestone:	8.0.0

[AaronRobinsonMSFT]

@vitek-karas Can we close this now?

[vitek-karas]

Yes - this is done I think.