Feature: #99341 - Introduce CLI create user command

See forge#99341

Description

A new CLI command backend:user:create, which automates backend user creation, is introduced as an alternative to the existing backend module.

Impact

You can now use ./bin/typo3 backend:user:create to create a backend user without touching the GUI.

Example

Interactive / guided setup (questions/answers):

./bin/typo3 backend:user:create
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User creation using environment variables:

TYPO3_BE_USER_NAME=username \
TYPO3_BE_USER_EMAIL=admin@example.com \
TYPO3_BE_USER_GROUPS=<comma-separated-list-of-group-ids> \
TYPO3_BE_USER_ADMIN=0 \
TYPO3_BE_USER_MAINTAINER=0 \
./bin/typo3 backend:user:create --no-interaction
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