[Enhancement] Add config events for Reset, Save, Save All

[dfgHiatus]

I am developing a mod in which a user can define strings in their configuration. It would be helpful for me (and I imagine other developers) to know when a mod's configuration is/was saved. Likewise, this could be extended to the "Reset" and "Save all" operations as well, and implemented similarly to how OnThisConfigurationChanged and OnAnyConfigurationChanged works.

I am not aware of any similar/existing functionality already in NeosModLoader. If there is please let me know and I will amend the issue.