Feature/user managment kacper solution 2

[kacperjagiela]

Ticket: codeandpepper/janush#87

Backend:

• First of all you need to add administrators groups in Cognito (of course in IaC code).
• Add GraphQL endpoint (AWS AppSync service)
• Add GraphQL/AppSync query to get users from AWS Cognito (paginated, filtered as in designs)
• Add GraphQL/AppSync query to get groups from AWS Cognito
• Add GraphQL/AppSync mutation to be able to add new user to AWS Cognito
• Add GraphQL/AppSync mutation to add new group to AWS Cognito
• Add GraphQL/AppSync mutation to add user to existing group
• Add GraphQL/AppSync mutation to edit user
• Add GraphQL/AppSync mutation to edit group
• Add GraphQL/AppSync mutation to delete user
• Add GraphQL/AppSync mutation to delete group
• Add GraphQL/AppSync mutation to delete user from certain group
• Add GraphQL/AppSync mutation to enable/disable user (it should enable disabled user and disable enabled user)

Frontend:

• Proceed according to the designs using GraphQL queries/mutation done via backend.