Timings Improvements

use a better stack for managing timing tree relationships
remove unnecessary synchronization (i forgot HANDLERS is only touched on main)

this should hopefully resolve any data integrity concerns

Spigot-API-Patches/Use-ASM-for-event-executors.patch

@@ -29,7 +29,7 @@ index 524231ecc..082f2f0c5 100644
      <build>
 diff --git a/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java b/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java
 new file mode 100644
-index 000000000..72318d42d
+index 000000000..5b28e9b1d
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/executor/MethodHandleEventExecutor.java
 @@ -0,0 +0,0 @@
@@ -39,6 +39,7 @@ index 000000000..72318d42d
 +import java.lang.invoke.MethodHandles;
 +import java.lang.reflect.Method;
 +
++import com.destroystokyo.paper.util.SneakyThrow;
 +import org.bukkit.event.Event;
 +import org.bukkit.event.EventException;
 +import org.bukkit.event.Listener;
@@ -70,7 +71,7 @@ index 000000000..72318d42d
 +        try {
 +            handle.invoke(listener, event);
 +        } catch (Throwable t) {
-+            throw new EventException(t);
++            SneakyThrow.sneaky(t);
 +        }
 +    }
 +}