Add a user management page

[atompie]

We need to add a user management page. Not to be confused with the customer profile. The tracardi user profile must allow to change password and personal information and add new users.

Originally posted by @atompie in #23

Tasks

• Create mapping for tracardi-user index #241
• Endpoint: Add endpoint to add/update users #242
• Endpoint: Add endpoint to remove users #243
• Service: create service to fetch user credentials and roles #244
• Connect user service with oAuth2 #245
• #259
• Generic table component based on react-window  tracardi-gui#73
• #273