[Users Management] Query for getting users from AWS Cognito

[MastalerzKamil]

Goal

Implementation plan

1. Create new CDK Construct for creating user in authentication module
2. Create Lambda with IAM Role to Cognito get list users for fetching users
3. Update schema by creating query that would create new user in Cognito
4. Connect query with Lambda as Data Source by creating resolver
5. Adding Unit tests