Port mapdata to 26.1.x

[a6tumn]

Description

• Switched to using Codec(s) in the map data classes rather than NBT tags

• Switced to using MapId to key map data rather than String

• Moved map state management into a dedicated class rather than having it be part of the map data implementations

• Split state management helpers into distinct ServerLevel and ClientLevel implementations which more closely aligns with new vanilla behavior

• Added AT entry for MapItemSavedData#getFrameKey(...) so it can be called in the map data constructors

• Updated call sites for the map items and network packets to reflect above changes

Summary

I looked into the vanilla map data changes and worked this out as a potential set of fixes to update our own map data. Overall, I think that these changes allow us to copy vanilla behavior more closely and simplify a lot of the extra code we had on top of MapItemSavedData. There may still be some unused methods that would not be required after these changes, but I will leave them for now until this PR gets some reviews.

[a6tumn]

@LightgraycaAT, you had some review comments on Albazavr's attempted port. Perhaps you would like to review this as well?