[TASK] Add various Composer scripts

This vastly simplifies running common commands for TYPO3 development.

E.g. executing PHPUnit can be done like this:

    composer test:php:unit

Since Composer uses Symfony Console this can even be shortened:

    composer t:p:u

Also arbitrary arguments can be passed to the executed command:

    composer t:p:u -- --filter unitTestMethodName

Change-Id: I3ef62417227b3c4c1c3d8f8f3662052ca36ed885
Resolves: #83249
Related: #84836
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/54959


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Sybille Peters <sypets@gmx.de>
Tested-by: Sybille Peters <sypets@gmx.de>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Reviewed-by: Patricia Tiedemann <pixelaeffchen@googlemail.com>
Tested-by: Patricia Tiedemann <pixelaeffchen@googlemail.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>