Produce JS-visible string results as UTF-16 at their source, including
numeric formatting, BigInt and BigFraction formatting, URI encoding,
console formatting, parser errors, regular expression errors, Intl and
Temporal records, LibUnicode locale boundaries, and LibWeb bindings.
Handle fractional radix formatting through the UTF-16 builder view.
Replace the Lagom C++ bindings generator invocation with the new Python
generator under Meta/Generators/libweb_bindings.
Fold the exposed-interface generation into the same generator entry
point, and keep generated overload metadata using the existing LibIDL
types for now.