[8.4] Add support for property hooks

Add hooks subnode to Stmt\Property and Param, which contains an
array of PropertyHook.

The property hook support is considered experimental

[8.4] Add support for property hooks

Add hooks subnode to Stmt\Property and Param, which contains an
array of PropertyHook.

The property hook support is considered experimental and subject
to change.

RFC: https://wiki.php.net/rfc/property-hooks

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Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this

Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this
representation measurably improves memory usage and performance.

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Add support for typed constants

RFC: https://wiki.php.net/rfc/typed_class_constants

Rename Stmt\PropertyProperty to PropertyItem

Remove MODIFIER_ prefix from node dumps

These constants are now called Modifiers::PUBLIC rather than
Class_::MODIFIER_PUBLIC etc, so update the dumped name as well.

Rename Stmt\StaticVar to StaticVar

This is part of a statement, not a statement by itself.

Remove PHP 5 parser

Add test for new in initializer

This already works because we don't validate initializer contents,
everything is accepted from a parser perspective.