Use UnsafeAccess in net8+ and UnsafeAccessType in net10+

[dadhi]

Reference tests in dotnet https://github.com/dotnet/runtime/blob/1ff7fbb4c61f08d36afe0e113a676a0fb332ffbc/src/tests/baseservices/compilerservices/UnsafeAccessors/UnsafeAccessorsTests.cs#L11

[dadhi]

Ok, experimenting with the EmitHacksTest I have found that we need support for UnsafeAccessorTypeAttribute likely in .NET 9 to access the non-public classes such as DynamicILGenerator and RuntimeILGenerator.

[dadhi]

Net 10 introduces the missing piece with UnsafeAccessType which enable to dive into non-public types without reflection. Let use it for perf and be closer to AOT enabled.
Here is the good deep dive https://andrewlock.net/exploring-dotnet-10-preview-features-9-easier-reflection-with-unsafeaccessortype/