Support readonly before DNF type

This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from reado

Support readonly before DNF type

This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from readonly properties with DNF types. We have to uglify the
grammar to avoid some shift/reduce conflicts. Thank you WordPress.

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