New feature: Spire Method

[LinnielDW]

Spiremethods, inspired by spirefields are a mechanism for 'adding' methods to models that do not override a method existing in their super.
The benefit of doing it this way over harmony patching and doing a model is type check is that across many mods, this may have a performance impact. By centralizing it in a central registry, we can do a type check against a dictionary and retrieve all the appropriate delegate methods in constant time.

A few notes about the implementation:

• SpireMethods are registered at game start but aren't patched until needed. This is just to reduce startup overhead. But if this isn't nice, I can remove it.
• It supports, async methods, void methods and methods with a return type.
• I wrote this myself, but for full disclosure: I did have an LLM review my code already and also had it write the comment documentation.

Example of a spiremethod as seen here: