Add tools to developer mode

[ralflang]

These should be available in developer mode:
https://phar.io/releases/phive.phar phive

And through phive:
php-cs-fixer
phpstan
phpunit9

[ralflang]

Current latest image has experimental implementation:

• Developer mode will install phive
• phive installs php-cs-fixer, phpunit, phpstan and box
• A phar build of horde-components is downloaded.

The horde-components is neither ci built nor signed, that needs improvement