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/Add-tick-times-API-and-mspt-command.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Add tick times API and /mspt command
 
 diff --git a/src/main/java/com/destroystokyo/paper/MSPTCommand.java b/src/main/java/com/destroystokyo/paper/MSPTCommand.java
 new file mode 100644
-index 0000000000..d0211d4f39
+index 00000000000..d0211d4f39f
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/MSPTCommand.java
 @@ -0,0 +0,0 @@
@@ -75,7 +75,7 @@ index 0000000000..d0211d4f39
 +    }
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
-index 9f1662ece5..e0d7832c3a 100644
+index 9f1662ece53..e0d7832c3a0 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
 @@ -0,0 +0,0 @@ public class PaperConfig {
@@ -87,7 +87,7 @@ index 9f1662ece5..e0d7832c3a 100644
          version = getInt("config-version", 20);
          set("config-version", 20);
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index 3c25436f15..5f57a9e1c8 100644
+index 3c25436f158..5f57a9e1c8d 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
 @@ -0,0 +0,0 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
@@ -147,7 +147,7 @@ index 3c25436f15..5f57a9e1c8 100644
 +    // Paper end
  }
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index e8d3528d51..4a41003203 100644
+index e8d3528d515..4a41003203b 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 @@ -0,0 +0,0 @@ public final class CraftServer implements Server {