[php-src] Issue #10864: Can we get compile time routines?

Issue: https://github.com/php/php-src/issues/10864 Author: divinity76 ### Description I have a large multi-megabyte JSON that is currently parsed several times per second, I also have OPCache enabled, would save time if the parsing could be done at compile-time rather than runtime, would be nice if i could do something like ```php $data = compile_time_routine(function() { return json_decode("large.json",true); }); ``` instead of ```php $data = json_decode("large.json",true); ``` with it being equivalent at runtime to ``` $data = array(...whatever json_decode returned...); ``` another example would be ``` echo "opcache compiled at " . compile_time_routine(function(){return date(DateTime::RFC3339);}); ``` being equivalent at runtime to ``` echo "opcache compiled at " . "2023-03-16T09:43:00+01:00"; ``` (i did not give the function name/argument/details much thought fwiw)