Clean up Timings and Async Chunk Configs

Renames a bunch of timings to be more appropriate for the new environment.

Many things dealt with sync loads which wasn't correct anymore.
adjusted timings to be a little bit more accurate here.

Also cleaned up old 1.13 async chunks configs so people won't keep
thinking they can change some of those configs when they can't.

Spigot-Server-Patches/Reduce-sync-loads.patch

@@ -268,7 +268,7 @@ index 0000000000..59aec10329
 +    }
 +}
 diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
-index 5b10562369..db0925f993 100644
+index 259af7095c..ea1117dc86 100644
 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
 +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
 @@ -0,0 +0,0 @@ public class ChunkProviderServer extends IChunkProvider {
@@ -276,7 +276,7 @@ index 5b10562369..db0925f993 100644
                  com.destroystokyo.paper.io.chunk.ChunkTaskManager.pushChunkWait(this.world, x, z);
                  // Paper end
 +                com.destroystokyo.paper.io.SyncLoadFinder.logSyncLoad(this.world, x, z); // Paper - sync load info
-                 this.world.timings.chunkAwait.startTiming(); // Paper
+                 this.world.timings.syncChunkLoad.startTiming(); // Paper
              this.serverThreadQueue.awaitTasks(completablefuture::isDone);
                  com.destroystokyo.paper.io.chunk.ChunkTaskManager.popChunkWait(); // Paper - async chunk debug
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java