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)

Improve class entry generation

Related to GH-6701

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

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necess

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necessary.

This ensures that release artifacts will never try to regenerate
stubs and thus fetch PHP-Parser, as long as you do not modify any
files.

Closes GH-5739.

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Generate method entries for ext/intl

Closes GH-5370

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal function

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal functions.

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

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Do not include the same stub multiple times

Closes GH-5322

Add various stubs for Intl

Closes GH-4826