Implemented: Generic Support for Methods in UnhollowerUtils

[Sewer56]

This simple patch adds support for fetching Generic methods via the GetIl2CppMethodInfoPointerFieldForGeneratedMethod API inside UnhollowerUtils.

Not much to say here, no API changes.
I implemented this in order to allow 3rd party libraries such as HarmonyX (in MelonLoader) to be able to successfully hook generic methods.

[Previously GetIl2CppMethodInfoPointerFieldForGeneratedMethod would return null and generic methods were not hookable.

[doombubbles]

Would really like to see this merged 👍

[hemisemidemipresent]

any updates about this getting merged?