Bug 1812055 - Add fast paths for the most common cases to...

Bug 1812055 - Add fast paths for the most common cases to JSStructuredCloneReader::readObjectField. r=sfink

On typical workloads, these fast paths for plain objects and array objects handle
at least 97% of cases. This is much faster than the generic `DefineDataProperty` code.

Differential Revision: https://phabricator.services.mozilla.com/D167685