problem

Implement a missing UI for appTokens, similar too elasticcloud UI:

• A new grid under preferences
  • The grid lists the description and created fields for all tokens of the user
  • Each token can be deleted
  • Accessable only for users with role sysadmin and/or API, for all other users it makes no sense
  • No separate role / api restriction like in elastic cloud UI - not possible at the moment - although it would increase security
• Create / copy dialog similar to the one from dockerhub - see below
•  

When creating new tokens, the description must be set by the user. After creation the token is shown once, similar to the docker hub window: