Creates the Twig\PmaGlobalVariable class to handle the 'pma' Twig global
variable.
The idea of this global variable is to automatically inject in all
templates some useful information.
For now it only includes `pma.version` to get the phpMyAdmin version
and `pma.text_dir` to get the text direction ('ltr' or 'rtl').
Adding new variables to the `pma` global variable should be done with
caution.
- https://twig.symfony.com/doc/3.x/advanced.html#globals
Signed-off-by: Maurício Meneghini Fauth <mauricio@fauth.dev>
