Add optional smart resolve sulotion

The smart resolvaion can guess most symbols but it might be slow so disabled by default users can turn on it in the editor setting

modules/gdscript/language_server/gdscript_language_protocol.h

@@ -79,6 +79,8 @@ public:
 	void notify_all_clients(const String &p_method, const Variant &p_params = Variant());
 	void notify_client(const String &p_method, const Variant &p_params = Variant(), int p_client = -1);
 
+	bool is_smart_resolve_enabled() const;
+
 	GDScriptLanguageProtocol();
 	~GDScriptLanguageProtocol();
 };