Support underscores in number literals #3073

Job	Run time
PHPStan (8.4)	15s
PHP 8.2	10s
PHP 8.3	10s
PHP 8.4	10s
cache-extra PHP 8.2	8s
cssinliner-extra PHP 8.2	10s
html-extra PHP 8.2	12s
inky-extra PHP 8.2	9s
Integration tests with PHP ${{ matrix.php-version }}	0s
intl-extra PHP 8.2	9s
markdown-extra PHP 8.2	19s
string-extra PHP 8.2	16s
twig-extra-bundle PHP 8.2	10s
cache-extra PHP 8.3	10s
cssinliner-extra PHP 8.3	9s
html-extra PHP 8.3	13s
inky-extra PHP 8.3	7s
intl-extra PHP 8.3	10s
markdown-extra PHP 8.3	14s
string-extra PHP 8.3	9s
twig-extra-bundle PHP 8.3	10s
cache-extra PHP 8.4	9s
cssinliner-extra PHP 8.4	8s
html-extra PHP 8.4	8s
inky-extra PHP 8.4	13s
intl-extra PHP 8.4	14s
markdown-extra PHP 8.4	7s
string-extra PHP 8.4	7s
twig-extra-bundle PHP 8.4	13s
	4m 59s

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