[Feature] Add meganations

[PlaceReporter99]

Is your feature request related to a problem? Please describe.

Players have formed things called meganations, which are a group of nations ruled under one government.

Describe the solution you'd like

It would be nice to add meganations, making it easier to manage. You should be able to tp to all other nations in the meganation and nations in allied meganations.

Additional context

No response