HOTFIX add contact import to onboarding

[Boehrsi]

Link to the given issue Internal bug tracker

Describe what the problem was / what the new feature is Import was missing during onboarding.

Describe your solution

• Added the UI to the JSON file
• Added the required callbacks
• Adjusted the BloC to allow "ui-less" contact import

Additional context

• Fixed typo in generation tool
• Fixed generated class