Integrate @materia/users in @materia/server and use admin users to remove rootPassword

[thyb]

If we integrate @materia/users in this repository and install it by default in every applications, we can use admin role to connect materia-server admin API instead of using rootPassword.

Advantage:

• no rootPassword written in clear text in materia.json & materia.prod.json
• Same login system than the one used in the application (not duplicated in 2 different system)

If no database setup, we can still connect to a local sqlite database to have the minimal user structure

If no admin user defined, need a cli command to initialize the first admin user (to let materia-designer connect the admin API)

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• Materia Version: v1.0.0-beta.1