[TASK] Allow to create admins as system maintainers in Install Tool

This patch add a checkbox to add the new administrator as system
maintainer.

Resolves: #83178
Releases: master
Change-Id: I814ed693ef8e57f2ae58e417727684a701b1fcfd
Reviewed-on: https://review.typo3.org/54898


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>