Add optional goto definition support for native symbols

This action will show help for target symbol in godot editor and bring the godot editor window to foreground
Improved markdown documentation for symbols.

modules/gdscript/language_server/gdscript_language_protocol.h

@@ -84,6 +84,7 @@ public:
 	void notify_client(const String &p_method, const Variant &p_params = Variant(), int p_client = -1);
 
 	bool is_smart_resolve_enabled() const;
+	bool is_goto_native_symbols_enabled() const;
 
 	GDScriptLanguageProtocol();
 	~GDScriptLanguageProtocol();