Configure sentry for monitoring errors

[ryanchristo]

Ref: #143 (review)

...integrating sentry as we have it for regen-web. I.e. In the try-catch block we have here now, we could also raise a sentry alert, which would give us notifications etc. and also sentry would capture any other unhandled exceptions as well

We should consider adding sentry so that we can better track application errors, starting with raising an alert wherever we console error rather than throwing an error, specifically within any try-catch blocks that attempt to query for additional information such as metadata or historical group proposals and votes from the indexer endpoint.