Explicity bind the main plugin class in the singleton scope

proxy/src/main/java/com/velocitypowered/proxy/plugin/loader/java/VelocityPluginModule.java

@@ -2,6 +2,7 @@ package com.velocitypowered.proxy.plugin.loader.java;
 
 import com.google.inject.Binder;
 import com.google.inject.Module;
+import com.google.inject.Scopes;
 import com.velocitypowered.api.command.CommandManager;
 import com.velocitypowered.api.event.EventManager;
 import com.velocitypowered.api.plugin.PluginDescription;
@@ -27,6 +28,8 @@ class VelocityPluginModule implements Module {
 
   @Override
   public void configure(Binder binder) {
+    binder.bind(description.getMainClass()).in(Scopes.SINGLETON);
+
     binder.bind(Logger.class).toInstance(LoggerFactory.getLogger(description.getId()));
     binder.bind(ProxyServer.class).toInstance(server);
     binder.bind(Path.class).annotatedWith(DataDirectory.class)