Add method to mark user terms of use accepted

Description

Add an API endpoint or method to existing endpoint to allow the frontend to mark that the authenticated user has accepted the terms of use.

Further details

• This will be added to the AccountDetails model from #10 (closed)

Task list

• Add boolean field to existing model to mark terms of use accepted or not.
  • Not nullable, default value is false.
• Add API endpoint to mark accepted
  • Suggest: PATCH method to /v1alpha1/account expecting JSON body: {"terms_of_use_accepted": true}

Acceptance criteria

• API endpoint to set terms of use accepted for a user account created.

Links/references