Added SSO to retrieve credentials for calling Cognito related queries

[KevinHa48]

Summary of changes

• Depends on: Update portal to new submodule location and add AWS credential related env variables portal#10 (potential shortcomings of using this method are also mentioned here
• AWS-CLI (local installation) will be needed for developers to dynamically retrieve credentials to call Cognito services
• boto3 uses the AWS_CONFIG_FILE and AWS_PROFILE Docker environment variables to make its calls.
• aws configure sso should be run by developers which creates the AWS_CONFIG_FILE directory and AWS_PROFILE
• See README.md in the portal repo for setup details.

[gcarvellas]

mypy fails

root@razer-blade-15:/portal/backend# make check
python3 -m mypy .
database/cognito.py:3: error: Skipping analyzing "botocore.exceptions": module is installed, but missing library stubs or py.typed marker  [import]
database/cognito.py:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
database/cognito.py:5: error: Skipping analyzing "boto3": module is installed, but missing library stubs or py.typed marker  [import]
database/cognito.py:10: error: Function is missing a return type annotation  [no-untyped-def]
database/cognito.py:10: note: Use "-> None" if function does not return a value
database/cognito.py:13: error: Function is missing a return type annotation  [no-untyped-def]
app.py:19: error: Call to untyped function "CognitoIdentityProviderWrapper" in typed context  [no-untyped-call]

Before doing anything I'd wait for #43 to get merged

[gcarvellas]

#46

[gcarvellas]

castlepointanime/portal#12

[gcarvellas]

Thanks @KevinHa48 for the great work on this!

This MR will also integrate the cognito user querying into POST /contracts. When we query for a random approver, we first query the MongoDB for any user with the approver role, then we take that username and query the cognito DB for their email.

This is done to separate non confidential data in the MongoDB and confidential data in Cognito.

I need to test this some more before merging.