feat(Core): add getGroups() to Core

src/main/java/minevalley/core/api/Core.java

@@ -785,6 +785,15 @@ public static BankAccount createBankAccount(Registrant holder) {
         return server.createBankAccount(holder);
     }
 
+    /**
+     * Get all loaded groups.
+     *
+     * @return list of all groups
+     */
+    public static List<Group> getGroups() {
+        return server.getGroups();
+    }
+
     /**
      * Gets the group (organization/company) with the specific name.
      *

src/main/java/minevalley/core/api/CoreServer.java

@@ -185,6 +185,8 @@ public interface CoreServer {
 
     BankAccount createBankAccount(Registrant holder);
 
+    List<Group> getGroups();
+
     Group getGroup(String name);
 
     Region getRegion(int id);

src/main/java/minevalley/core/api/enums/ToastStyle.java

@@ -0,0 +1,5 @@
+package minevalley.core.api.enums;
+
+public enum ToastStyle {
+    GOAL, TASK, CHALLENGE
+}