Enable Email Alerts and Reports for Superset

[himeshr]

After superset upgrade, we have received a feature request to enable Email functionality there..
https://avni.freshdesk.com/a/tickets/4966
https://superset.apache.org/docs/configuration/alerts-reports/
We could do this using SMTP config already in use at Metabase..
Figure out SMTP password from Vivek / Vinay, not available in keeweb as of now.

[vedfordev]

@himeshr there is issue in setup recipients in 4.0.1 Issue

[himeshr]

Upgrade superset to https://github.com/apache/superset/releases/tag/4.0.2 in test env and check that issue is resolved..
if yes, we'll do that for prod as well pretty soon

[vedfordev]

@himeshr I tried with following ways it is not working.

1. without configure celery and tried with same tz and +- 5:30
2. configure celery with providing db url