More configurable snapshot restore functionality

### The Problem

Restoring from a backup on a Fabric server, where dimensions are stored inside of the main world folder in DIM1 and DIM-1, does not work. In addition, [Textile Backup](https://github.com/Szum123321/textile_backup), which is a backup mod for Fabric, omits the world subdirectory and instead has the world files directly in the archive. For example, WorldEdit expects files in `backup/world//world/region` whereas Textile Backup has files in `backup/world//region`. Both WorldEdit and Textile Backup have some directory configuration; you can change WorldEdit's snapshot directory, and you can also change Textile Backup's backup location, but neither mod lets you change the config so they are compatible with each other.

### A Solution

The directory structure for the archives themselves should be configurable. This could be set in the main WorldEdit config file, or possibly while selected an archive with the /snap command.

### Alternatives

This problem _could_ be fixed on Textile Backup's side but imo it would make more sense for the mod _reading_ the archive to accept formats used by many mods, and not WorldEdit's own specific structure. (also, I'm sure that Textile Backup isn't the only backup plugin/mod to not save its backups in this one specific format)

### Anything Else?

_No response_