Switch client sync to use buffers instead of tags for data

[gustovafing]

What

Switches client sync data to be written into buffers instead of as tags, since NBT has a much higher packet size than buffers causing network issues.

AI Used: Jurre helping to debug an issue with Claude.

How Was This Tested

Tested a variety of BEs with client sync data in game, no issues

[screret]

The classes in the com.gregtechceu.gtceu.api.sync.transformers.gtceu package should be in com.gregtechceu.gtceu.common.sync.transformers, no?

[screret]

From the (failed) tests' logs:

[08:15:07] [Server thread/ERROR] [GregTechCEu/]: Sync: Failed to deserialize field rotorMaterial
java.lang.ClassCastException: class net.minecraft.nbt.CompoundTag cannot be cast to class net.minecraft.nbt.StringTag
	at com.gregtechceu.gtceu.api.sync_system.data_transformers.ResourceLocationReferenceTransformer.deserializeNBT(ResourceLocationReferenceTransformer.java:31)
	at com.gregtechceu.gtceu.api.sync_system.SyncDataHolder.deserializeNBT(SyncDataHolder.java:95)
	at com.gregtechceu.gtceu.api.sync_system.managed.ManagedSyncBlockEntity.load(ManagedSyncBlockEntity.java:71)
	at com.gregtechceu.gtceu.api.machine.MetaMachine.load(MetaMachine.java:166)
...