Add tests for TimeZone features
Add tests for TimeZone features

We describe in the spec that time zone names are canonicalized,
including capitalization and IANA Link Names. Add tests for constructing
a TimeZone from these.

As well, test the 'name' property which is supposed to be the
canonicalized identifier.

Note: Different implementations of Intl.DateTimeFormat canonicalize
IANA Link Names differently! This example picks one that happens to
canonicalize the same in the IANA and CLDR databases.
See for background:
https://stackoverflow.com/questions/45867761/javascript-intl-api-gives-different-results-in-chrome

js-temporal/temporal-polyfill,js-temporal/temporal-polyfill,js-temporal/temporal-polyfill