Add option to force passwords for public conversations

[nickvergessen]

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Since we return the room object we can do this already, but the moderator has no way to see the password atm

[miaulalala]

• Config option to determine if server only allows password protected talk conversations
• Change "create Room" endpoint (RoomController) to have a password option
• Password policy checking on password not empty or config option set

If config option is given

• Reject room creation if global password option is set an no password is given or it doesn't match password policy
• RoomService -> setPassword as inspiration for how to store and validate a password

[miaulalala]

The frontend part is missing, the backend part is finished. The password is stored as a promise and not submitted in the intial request.