Add logging for failed subscriber creation

[TylerMatteo]

Add logging to the /subscribers POST endpoint that logs failed subscriber creation to Sentry

• Configure ZAP Search back end to integrate with Sentry for error logging
• Use the existing zap-search-server app in Sentry
• Use job id returned by contact creation endpoint to poll Import Contacts Status endpoint until the job returns a completed, or errored, or failed status.
• If any unsuccessful status is reported, or if maximum polling time limit is reached, log details to Sentry with user's email, anonymous_id uuid, and selected subscription topics
• Existing /subscribers endpoint should still return when the original contact creation endpoint returns successfully.

[TylerMatteo]

@dhochbaum-dcp I don't have an exact polling rate and max time limit in mind but in general it can be longer with longer pauses between attempts - something like 5 minutes, checking every 10-30 seconds.

[TylerMatteo]

@dhochbaum-dcp For context, I asked Sendgrid about webhooks to handle this sort of thing and they basically said to do what I described about:

[TylerMatteo]

@dhochbaum-dcp - @horatiorosa did a spike looking at different Sentry packages for Nest a while back because, at the time, Sentry didn't have an official one. However, they came out with one recently so I say let's try using that :D