Bug 1617972. Add a table that stores the exception type of DOM errors. r=peterv

The callsite in DOMIntersectionObserver did end up throwing a RangeError, as the
spec requires, because in the end we just used the exception code to determine
the kind of exception to throw, but was misleading about what it was doing.

Differential Revision: https://phabricator.services.mozilla.com/D64175