Improve HarmonySharedState for use in multiple loading contexts

The current implementation leads to duplicate shared state when Harmony is loaded in a non-Unity process (like a .exe) and that prevents multiple mods from patching the same method.

At the end of this ChatGPT discussion is a suggestion that needs to be explored. The claim is that its backwards compatible and solves the problem this Issues rises.

https://chatgpt.com/share/68f013cd-b1b0-8009-8be0-1d3a3c182966

This needs to be implemented and tested. In both: the unity case and a single .exe case (maybe make sure it actually fails first).