Update PostOrder names and don't use lombok in API

api/geyser/src/main/java/org/geysermc/geyser/api/event/Subscribe.java

@@ -25,10 +25,6 @@
 
 package org.geysermc.geyser.api.event;
 
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import lombok.experimental.Accessors;
-
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -58,9 +54,6 @@ public @interface Subscribe {
     /**
      * Represents the post order of an event.
      */
-    @Accessors(fluent = true)
-    @Getter
-    @AllArgsConstructor
     enum PostOrder {
 
         /**
@@ -68,12 +61,12 @@ public @interface Subscribe {
          * allow for other events to customize
          * the outcome
          */
-        LOWEST(net.kyori.event.PostOrders.FIRST),
+        FIRST(net.kyori.event.PostOrders.FIRST),
 
         /**
          * The second lowest priority.
          */
-        LOW(net.kyori.event.PostOrders.EARLY),
+        EARLY(net.kyori.event.PostOrders.EARLY),
 
         /**
          * Normal priority. Event is neither
@@ -84,14 +77,27 @@ public @interface Subscribe {
         /**
          * The second highest priority
          */
-        HIGH(net.kyori.event.PostOrders.LATE),
+        LATE(net.kyori.event.PostOrders.LATE),
 
         /**
          * The highest of importance! Event is called
          * last and has the final say in the outcome
          */
-        HIGHEST(net.kyori.event.PostOrders.LAST);
+        LAST(net.kyori.event.PostOrders.LAST);
 
         private final int postOrder;
+
+        PostOrder(int postOrder) {
+            this.postOrder = postOrder;
+        }
+
+        /**
+         * The numerical post order value.
+         *
+         * @return numerical post order value
+         */
+        public int postOrder() {
+            return this.postOrder;
+        }
     }
 }

api/geyser/src/main/java/org/geysermc/geyser/api/event/connection/ConnectionEvent.java

@@ -25,22 +25,26 @@
 
 package org.geysermc.geyser.api.event.connection;
 
-import lombok.RequiredArgsConstructor;
+import org.checkerframework.checker.nullness.qual.NonNull;
 import org.geysermc.geyser.api.connection.GeyserConnection;
 import org.geysermc.geyser.api.event.Event;
 
 /**
  * An event that contains a {@link GeyserConnection}.
  */
-@RequiredArgsConstructor
 public abstract class ConnectionEvent implements Event {
     private final GeyserConnection connection;
 
+    public ConnectionEvent(@NonNull GeyserConnection connection) {
+        this.connection = connection;
+    }
+
     /**
      * Gets the {@link GeyserConnection}.
      *
      * @return the connection
      */
+    @NonNull
     public GeyserConnection connection() {
         return this.connection;
     }

api/geyser/src/main/java/org/geysermc/geyser/api/event/downstream/ServerDefineCommandsEvent.java

@@ -25,6 +25,7 @@
 
 package org.geysermc.geyser.api.event.downstream;
 
+import org.checkerframework.checker.nullness.qual.NonNull;
 import org.geysermc.geyser.api.connection.GeyserConnection;
 import org.geysermc.geyser.api.event.Cancellable;
 import org.geysermc.geyser.api.event.connection.ConnectionEvent;
@@ -38,7 +39,7 @@ public class ServerDefineCommandsEvent extends ConnectionEvent implements Cancel
     private final Set<? extends CommandInfo> commands;
     private boolean cancelled;
 
-    public ServerDefineCommandsEvent(GeyserConnection connection, Set<? extends CommandInfo> commands) {
+    public ServerDefineCommandsEvent(@NonNull GeyserConnection connection, @NonNull Set<? extends CommandInfo> commands) {
         super(connection);
         this.commands = commands;
     }
@@ -48,6 +49,7 @@ public class ServerDefineCommandsEvent extends ConnectionEvent implements Cancel
      *
      * @return a mutable collection of the commands sent over
      */
+    @NonNull
     public Set<? extends CommandInfo> commands() {
         return this.commands;
     }

api/geyser/src/main/java/org/geysermc/geyser/api/event/lifecycle/GeyserDefineCommandsEvent.java

@@ -25,6 +25,7 @@
 
 package org.geysermc.geyser.api.event.lifecycle;
 
+import org.checkerframework.checker.nullness.qual.NonNull;
 import org.geysermc.geyser.api.command.Command;
 import org.geysermc.geyser.api.command.CommandManager;
 import org.geysermc.geyser.api.event.Event;
@@ -38,5 +39,5 @@ import java.util.Map;
  * @param commands a mutable list of the currently
  *                 registered default commands
  */
-public record GeyserDefineCommandsEvent(CommandManager commandManager, Map<String, Command> commands) implements Event {
+public record GeyserDefineCommandsEvent(@NonNull CommandManager commandManager, @NonNull Map<String, Command> commands) implements Event {
 }