[1.21.5] Crash when trying to save world with chunks forceloaded through NeoForge

[RedstoneDubstep]

Minecraft Version: 1.21.5

**NeoForge Version:**21.5.14-beta

Logs: Crash report https://pastebin.com/87ZLwbQ9

Steps to Reproduce:

1. Create a new singleplayer world
2. Through a custom mod/test mod, request any chunk using NeoForge's TicketController for a BlockPos owner or an Entity owner. I did this the following way: SecurityCraft.CAMERA_TICKET_CONTROLLER.forceChunk(serverLevel, dummyEntity, x, z, true, false); with dummyEntity being of type SecurityCamera.
3. Allow your world to save, either by entering the pause menu or waiting until the world autosaves.
4. Observe the game crashing

Description of issue:
As discussed in Discord, the issue is NeoForge's ForcedChunkManager trying to encode its chunks in vanilla's TicketStorage (see TicketStorage#37), and using a custom codec to do so. This codec effectively tries to save a Map<UUID, TicketSet> and a Map<BlockPos, TicketSet> to NBT, for storage within the world data file. However, for the Java maps to be properly convertible to a CompoundTag for storage, both key entries (BlockPos and UUID) need to be serialized to a String, which is not happening currently due to the wrong codecs being used (they're currently both converted to an IntStream, which CompoundTag cannot deal with). This leads the game to crash since the ForcedChunkManager data cannot be saved to NBT.

Relevant Discord conversation with potential suggestions: https://discord.com/channels/313125603924639766/852298000042164244/1357804883260084395