Remove buffering in CraftBlock getNMS and getNMSFluid

[Biquaternions]

Did as requested.
Honestly, I'd recommend preferably doing a little context analysis of the internal calls before actually merging.

For context, calls involved in getNMS include:

1. Retrieving a Chunk in net.minecraft.world.level.Level#getBlockState using net.minecraft.world.level.Level#getChunk.
2. If the Chunk is not loaded, it will fallback using net.minecraft.world.level.ServerChunkCache#getChunkFallback.
3. If the fallback fails to load the chunk asynchronously, it will schedule the load in the main thread and will force the async thread to wait using net.minecraft.world.level.ServerChunkCache#syncLoad.

If there were a lock, syncLoad can become troublesome, but seems like this is not the case on Leaf as it was on Fish.
Still, a little bit more research will be required to see if every buffered call to functions in CraftBlock that internally call getNMS are actually safe and free of possible deadlocks.