Make a view for seeing the content that would go into digest emails

[timabbott]

We had a request from folks in the FHIR community for a convenient way to see "hot topics", new users, and other details that we currently include in Zulip's digest emails feature (which has been stagnant for a long time, in part because it's annoying to develop on an email that's hard to trigger manually).

The first step for working on this is to create a view for seeing the digest data; this is better both for developing the digest emails feature as well as the use case for FHIR. I'm thinking we create a new /digest view, that can (for v1) use same janky template rendering logic as the digest emails.

To support this, we need to create a Django view function for /digest, that basically calls handle_digest_email with an option to, rather than calling send_future_email at the end (to trigger the digest email), instead just renders the HTML template to the web.

It should be possible to test this in a development environment, and then we can deploy to chat.zulip.org for further iteration.

[niquola]

@timabbott do you consider digest page will be calculated and cached or calculated on fly? How about do this in SQL, not by using ORM?

[zy964c]

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