bfr authored Sep 05, 2019 and Benni Mack committed Feb 14, 2020

Transform CommandRegistry into a symfony CommandLoader which
allows console commands to be created on demand.
That means commands are lazy loaded in order to avoid creating
all commands with all their dependencies in every console
invocation. Command will now be loaded when they are either
executed or when command metadata is required (e.g. for
the command listing)

The `site:list` command is adapted to make use of dependency injection.

Releases: master
Resolves: #89139
Change-Id: I64256bf2dc21f0f3fe434aa5dff6176f0fe22233
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61630


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Achim Fritz <af@achimfritz.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Achim Fritz <af@achimfritz.de>
Reviewed-by: Benni Mack <benni@typo3.org>