Optimize Network Manager to not need synchronization

Removes synchronization from sending packets
Makes normal packet sends no longer need to be wrapped and queued like it use to work.
Adds more packet queue immunities on top of keep alive to let the following scenarios go out
without delay:
  - Keep Alive
  - Chat
  - Kick
  - All of the packets during the Player Joined World event

Hoping that latter one helps join timeout issues more too for slow connections.

Removes processing packet queue off of main thread
  - for the few cases where it is allowed, order is not necessary nor
    should it even be happening concurrently in first place (handshaking/login/status)

Ensures packets sent asynchronously are dispatched on main thread

This helps ensure safety for ProtocolLib as packet listeners
are commonly accessing world state. This will allow you to schedule
a packet to be sent async, but itll be dispatched sync for packet
listeners to process.

This should solve some deadlock risks

This may provide a decent performance improvement because thread synchronization incurs a cache reset
so by avoiding ever entering a synchronized block, we get to avoid that, and packet sending is a really
hot activity.

Spigot-Server-Patches/Fire-event-on-GS4-query.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Fire event on GS4 query
 
 
 diff --git a/src/main/java/net/minecraft/server/RemoteConnectionThread.java b/src/main/java/net/minecraft/server/RemoteConnectionThread.java
-index 66bfbcf02b..d821ef9a75 100644
+index 66bfbcf02b5..d821ef9a757 100644
 --- a/src/main/java/net/minecraft/server/RemoteConnectionThread.java
 +++ b/src/main/java/net/minecraft/server/RemoteConnectionThread.java
 @@ -0,0 +0,0 @@ public abstract class RemoteConnectionThread implements Runnable {
@@ -26,7 +26,7 @@ index 66bfbcf02b..d821ef9a75 100644
          return this.b.getPlayerCount();
      }
 diff --git a/src/main/java/net/minecraft/server/RemoteStatusListener.java b/src/main/java/net/minecraft/server/RemoteStatusListener.java
-index f4f4e31d3c..d502593847 100644
+index f4f4e31d3c2..d5025938473 100644
 --- a/src/main/java/net/minecraft/server/RemoteStatusListener.java
 +++ b/src/main/java/net/minecraft/server/RemoteStatusListener.java
 @@ -0,0 +0,0 @@ public class RemoteStatusListener extends RemoteConnectionThread {
@@ -184,7 +184,7 @@ index f4f4e31d3c..d502593847 100644
          }
      }
 diff --git a/src/main/java/net/minecraft/server/RemoteStatusReply.java b/src/main/java/net/minecraft/server/RemoteStatusReply.java
-index 848b5c3f0e..73efea7e13 100644
+index 848b5c3f0e0..73efea7e135 100644
 --- a/src/main/java/net/minecraft/server/RemoteStatusReply.java
 +++ b/src/main/java/net/minecraft/server/RemoteStatusReply.java
 @@ -0,0 +0,0 @@ public class RemoteStatusReply {