add registerCommands() method

lib/src/main/java/net/tomatentum/marinara/registry/InteractionRegistry.java

@@ -1,10 +1,15 @@
 package net.tomatentum.marinara.registry;
 
 import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 
 import net.tomatentum.marinara.handler.InteractionHandler;
 import net.tomatentum.marinara.interaction.InteractionType;
+import net.tomatentum.marinara.interaction.commands.ApplicationCommandDefinition;
+import net.tomatentum.marinara.interaction.commands.ExecutableCommandDefinition;
+import net.tomatentum.marinara.interaction.methods.CommandInteractionMethod;
 import net.tomatentum.marinara.interaction.methods.InteractionMethod;
 import net.tomatentum.marinara.wrapper.LibraryWrapper;
 
@@ -23,6 +28,24 @@ public class InteractionRegistry {
         }
     }
 
+    public void registerCommands() {
+        List<ApplicationCommandDefinition> defs = new ArrayList<>();
+        List<ExecutableCommandDefinition> execDefs = interactionMethods.stream()
+            .filter((x) -> x.getClass().isAssignableFrom(CommandInteractionMethod.class))
+            .map((x) -> ((CommandInteractionMethod)x).getCommandDefinition())
+            .toList();
+
+        execDefs.forEach((def) -> {
+            Optional<ApplicationCommandDefinition> appDef = defs.stream()
+                .filter((x) -> x.applicationCommand().equals(def.applicationCommand()))
+                .findFirst();
+            if (appDef.isPresent())
+                appDef.get().addExecutableCommand(def);
+            else
+                defs.add(new ApplicationCommandDefinition(def.applicationCommand()).addExecutableCommand(def));
+        });
+    }
+
     public void handle(Object context) {
         interactionMethods.forEach((m) -> {
             InteractionType type = wrapper.getInteractionType(context.getClass());