LibWeb: Add ReadableStream.locked/cancel()/getReader()

Author: https://github.com/mattco98
Commit: 36ca1386e8
Pull-request: https://github.com/SerenityOS/serenity/pull/18109
Reviewed-by: https://github.com/linusg ✅

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -46,6 +46,7 @@ static bool is_platform_object(Type const& type)
         "Path2D"sv,
         "PerformanceEntry"sv,
         "PerformanceMark"sv,
+        "ReadableStreamDefaultReader"sv,
         "Range"sv,
         "ReadableStream"sv,
         "Request"sv,