Chore: Add Captainhook & PHPCS to composer require-dev and sample captainhook config

[kkrieger85]

Add captainhook and PHPCS to composer require-dev section
Add sample captainhook config

closes #1120 (duplication)
refs #947 #982

Please consider, that commit hooks are disabled in captainhook.json

You could test it by installing packages with composer and using the PHPCS Rule with using the command in captainhook.json

[tmotyl]

I would love to have php-cs fixer in place.
This change however is missing few pieces:

1. php-cs-fixer configuration file (lets start with config which is not making too much changes in the codebase - and add new rules later on
2. github action to validate codestyle on PR
3. use friendsofphp/php-cs-fixer v3 instead of v2

[kkrieger85]

Feel free to update my PR

[sreichel]

Seems related to #2400