Declare ext/intl constants in stubs - part 10 (#9280)

Fix GH-7939: Cannot unserialize IntlTimeZone objects

As it is now, `IntlTimeZone`, `IntlCalendar` and `IntlDateFormatter`
and some other intl class instances can be serialized, but the

Fix GH-7939: Cannot unserialize IntlTimeZone objects

As it is now, `IntlTimeZone`, `IntlCalendar` and `IntlDateFormatter`
and some other intl class instances can be serialized, but the
representation is meaningless, and unserialization yields uninitialized/
unusable objects. To prevent users from noticing this too late, we deny
serialization of such objects in the first place.

Closes GH-7945.

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Add explicit IntlPartsIterator::getRuleStatus() method

Rather than doing a magic forward, explicitly add a forwarding
method. This must be the most frivolous use of get_method I've
e

Add explicit IntlPartsIterator::getRuleStatus() method

Rather than doing a magic forward, explicitly add a forwarding
method. This must be the most frivolous use of get_method I've
ever seen.

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Declare tentative return types for ext/intl (#6986)

Generate ext/intl class entries from stubs

Closes GH-6670