[FEATURE] Add a Message/Job Status summary endpoint

[imyousuf]

Is your feature request related to a problem? Please describe.
There is no way to understand the status of messages and jobs by channel; so it difficult to say what is the current status summary.

Describe the solution you'd like
We want an endpoint that would summarize by channel number of messages dispatched vs non-dispatched and then by consumers jobs queued, inflight, delivered and dead.

Describe alternatives you've considered
Currently the alternate is to run query in the DB with group by

Additional context