Declare ext/intl constants in stubs - part 7 (#9269)

Declare Transliterator::$id as readonly to unlock subclassing it

Closes GH-9167.

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 more specific array return type hints for various extensions - part 2

ext/ftp, ext/gmp, ext/intl

Closes GH-7433

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

Use typed proprety for Transliterator::$id

This is a read-only property for which Transliterator internally
assigns a string value.

Also clean up the code handling this property

Use typed proprety for Transliterator::$id

This is a read-only property for which Transliterator internally
assigns a string value.

Also clean up the code handling this property a bit.

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Implicitly enable function entry generation when class entry generation is enabled

Closes GH-6675

Add support for generating class entries from stubs

Closes GH-6289

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Improve parameter names in ext/intl

Closes GH-6309

Generate method entries for ext/intl

Closes GH-5370

Do not include the same stub multiple times

Closes GH-5322

Add various stubs for Intl

Closes GH-4826