LibJS: Add the global escape() & unescape() methods

Author: https://github.com/IdanHo
Commit: 442ef63008
Pull-request: https://github.com/SerenityOS/serenity/pull/7817
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibJS/Runtime/GlobalObject.h

@@ -68,6 +68,8 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(decode_uri);
     JS_DECLARE_NATIVE_FUNCTION(encode_uri_component);
     JS_DECLARE_NATIVE_FUNCTION(decode_uri_component);
+    JS_DECLARE_NATIVE_FUNCTION(escape);
+    JS_DECLARE_NATIVE_FUNCTION(unescape);
 
     NonnullOwnPtr<Console> m_console;