Apart from environmental stuff, the moodle_minimum_php_version_is_met()
function is executed by all installs (web, cli, database, ...)
and halts any installation (early) not meeting the PHP constraints.
Since PHP 8.2, placing the dollar sign outside the curly brace is deprecated when
the expression inside the braces resolves to a variable or an expression.
* Introduce a new php compatible library which can be used
early in execution, without Moodle dependencies
* Use it where we previously had hardcoded checks
This was originally suggested in MDL-39007.
