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

When playing on RMT, the plugin can get stuck switching maps sometimes. We theorized in the OP server that one of the issues is that the plugin tries to add a map that exceeds the server limit

Related to #120, but most likely not the only cause of that issue (Xertrov also mentioned a potential race condition when editing the room)

Describe the solution you'd like

The plugin should check for the file size before adding the map, and fetch another map if it exceeds the max size.

Additional context

Here's how the TMX Together plugin checks for the file size. The exact size limit is 7336960 octets, as set here

The TMX API returns the bool "SizeWarning" when getting the map info, which indicates if the map exceeds the size limit. The issue with using this is that Xertrov's API doesn't return this value, so the plugin would still need to manually check the file size when using his API