enhancement: batch map requests

[lodicolo]

Description

As an extension of #1375 I think it would be beneficial if we calculate a list of all maps that we need to load, and then send a singular request packet with a list of IDs.

I do not know if it would be equally feasible to also batch the map data responses (but this may hit some packet size limitation).

Intended Use-Case

This would help reduce the number of packets going over the wire that need to be processed during map transitions.

Duplicate Check

• This enhancement idea is not a duplicate to the best of my knowledge.