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/Remove-streams-from-Mob-AI-System.patch

@@ -10,7 +10,7 @@ Also optimise the stream.anyMatch statement to move to a bitset
 where we can replace the call with a single bitwise operation.
 
 diff --git a/src/main/java/net/minecraft/server/PathfinderGoal.java b/src/main/java/net/minecraft/server/PathfinderGoal.java
-index bdb90a3466..93009d83f0 100644
+index bdb90a34663..93009d83f07 100644
 --- a/src/main/java/net/minecraft/server/PathfinderGoal.java
 +++ b/src/main/java/net/minecraft/server/PathfinderGoal.java
 @@ -0,0 +0,0 @@
@@ -53,7 +53,7 @@ index bdb90a3466..93009d83f0 100644
  
      public static enum Type {
 diff --git a/src/main/java/net/minecraft/server/PathfinderGoalSelector.java b/src/main/java/net/minecraft/server/PathfinderGoalSelector.java
-index 935136771e..84d2abbcb9 100644
+index 935136771e7..84d2abbcb90 100644
 --- a/src/main/java/net/minecraft/server/PathfinderGoalSelector.java
 +++ b/src/main/java/net/minecraft/server/PathfinderGoalSelector.java
 @@ -0,0 +0,0 @@
@@ -232,7 +232,7 @@ index 935136771e..84d2abbcb9 100644
  
      public void a(PathfinderGoal.Type pathfindergoal_type, boolean flag) {
 diff --git a/src/main/java/net/minecraft/server/PathfinderGoalWrapped.java b/src/main/java/net/minecraft/server/PathfinderGoalWrapped.java
-index 29657fed75..1b800c558f 100644
+index 29657fed751..1b800c558f0 100644
 --- a/src/main/java/net/minecraft/server/PathfinderGoalWrapped.java
 +++ b/src/main/java/net/minecraft/server/PathfinderGoalWrapped.java
 @@ -0,0 +0,0 @@ public class PathfinderGoalWrapped extends PathfinderGoal {