Prototype errors-only Sentry

[chadwhitacre]

Sentry has gotten really complex over the years, and we have a hypothesis that a lot of users would be interested in a package of Sentry that was just for errors and therefore much simpler to operate. This ticket is about prototyping what such a package might look like.

[aldy505]

Would love to see this. Might benefit from that layered (or generated) sentry.conf.py file -- don't remember where the convo at. But please do not make this more complicated by creating a CLI that generates the docker-compose.yml file. I think it'll be better for people to add required containers on their own.

After this is implemented and (much better) if this is the default, we can lower the system requirements for running sentry.

[aldy505]

Closing this since it's implemented already #3190