enable JIT for PHP

It gave me a 30% page generation time decrease on the production project (1.0s -> 0.7s).

Won't enable when XDebug is enabled; JIT settings will be ignored then.

Articles about JIT: https://medium.com/@edouard.courty/make-your-php-8-apps-twice-as-fast-opcache-jit-8d3542276595, https://stitcher.io/blog/php-8-jit-setup

config/php/90-php.ini

@@ -20,6 +20,8 @@ session.gc_maxlifetime = 10800
 session.cookie_lifetime = 14400
 
 [opcache]
+opcache.jit=1255
+opcache.jit_buffer_size=512M
 opcache.revalidate_freq = 0
 opcache.validate_timestamps = 1
 opcache.max_accelerated_files = 100000