IL2CPP (AOT) performance using Expressions

The expression trees implementation used for AOT platforms is an interpreter, so it is pretty slow compared to a JIT compiler like Mono. We need to check if theres a good way (clean, readable and scalable) to implement a IL Reweaver.

References:

• https://forum.unity.com/threads/are-c-expression-trees-or-ilgenerator-allowed-on-ios.489498/page-2
• https://answers.unity.com/questions/1731418/il2cpp-compiled-expressions-performance.html
• https://github.com/dotnet/runtime/issues/17973