LibWeb: Implement the Gamepad API with SDL3

Author: https://github.com/Lubrsi
Commit: 74e0483ea5
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5902
Reviewed-by: https://github.com/gmta
Reviewed-by: https://github.com/trflynn89

Libraries/LibWeb/DOM/Document.cpp

@@ -4453,6 +4453,9 @@ bool Document::is_allowed_to_use_feature(PolicyControlledFeature feature) const
     case PolicyControlledFeature::EncryptedMedia:
         // FIXME: Implement allowlist for this.
         return true;
+    case PolicyControlledFeature::Gamepad:
+        // FIXME: Implement allowlist for this.
+        return true;
     }
 
     // 4. Return false.