feat(ui): implement script methods for character creation screen

src/net/connection/RealmConnection.cpp

@@ -297,3 +297,7 @@ void RealmConnection::RequestCharacterLogin(uint64_t id) {
     msg.Finalize();
     this->Send(&msg);
 }
+
+int32_t RealmConnection::GetExpansionLevel() const {
+    return this->m_accountExpansion;
+}

src/net/connection/RealmConnection.hpp

@@ -45,6 +45,7 @@ class RealmConnection : public NetClient {
         void SetSelectedRealm(uint32_t a2, uint32_t a3, uint32_t a4);
         void RequestCharacterEnum();
         void RequestCharacterLogin(uint64_t id);
+        int32_t GetExpansionLevel() const;
 };
 
 #endif