[Feat] Provide tool for easier management of functional accounts

[bpedersen2]

Summary

Currently functional accounts are only created once on a fresh installations and are hard to upgrade.
Especially the passwords are hashed in the database and there is no easy way to update those.

It would be nice to have a cli utility to add/modify local functional accounts. I would probably not provide an api endpoint for that.

[nitrosx]

@bpedersen2 I totally agree with you.
Would you be able to provide a list of functionalities for a POC?

[bpedersen2]

• list existing functional accounts
• create new functional account including setting a new password ( should do the same things the initial import from functional-accounts.json would do)
• set new password on functional account (including correct salting/hashing)
• alter assigned roles on functional account