Support match expression v2 rfc (#161)

The naming is based on `switch` statements.
Note that even if statement blocks were supported after a future RFC
those would probably be consid

Support match expression v2 rfc (#161)

The naming is based on `switch` statements.
Note that even if statement blocks were supported after a future RFC
those would probably be considered block **expressions**,
hence the `expr` name for `AST_MATCH_ARM`.

* Regenerate ast_stub.php
* Add missing files to package.xml

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