Display list of users on /admin/users

[joehewett]

We need a master list of society members. We should fetch this list of users from the API and display it in a DataTable on /uesrs.

[omarathon]

Need to model users in the database and have an authenticated GraphQL query to obtain the users (only specific users should be able to access this)

[omarathon]

Can put users into groups on Amplify. Will have groups member and exec. exec will be set manually, member will be automatically assigned via lambda function which runs as a Post Authentication Lambda function in Cognito https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-lambda-post-authentication.html.

[omarathon]

Decided to use /admin/users instead of /users so we can have admin dashboard at /admin

[omarathon]

Table containing each user with basic info for each user, or everything (all projects, talks, etc.) - toggleable. Use MaterialUI Data Grid, because has rich filtering and searching functionality (e.g. can filter by users in a specific project).