User Consent support

[mattjohnsonpint]

Problem Statement

It should be easier to create a "User Consent" workflow, where events are only sent to Sentry after a user approves the specific events.

Solution Brainstorm

This would be similar to getsentry/sentry-java#1988 and getsentry/sentry-cocoa#1780

[mattjohnsonpint]

There was some discussion about this previously with #80 (comment) and with #941 - though in both cases that's requiring a lot of work on the implementer's part.

[bruno-garcia]

https://www.notion.so/sentry/User-Consent-Requirements-ba63b834cfe24501866ba2957a9e7184

[mattjohnsonpint]

Just to add, this is also about capturing user feedback - not just consent. We already have a clear path for capturing feedback in a web app (via the browser SDK, as in our MVC sample app), but we don't have anything similar that would work for a desktop app.

[vaind]

FYI this is a P1 in getsentry/team-mobile#24 while being a P2 here

[mattjohnsonpint]

Updated priority of this. Though it's generally ok if such things are not synchronized, as priority is rather flexible and is relative to other items on each repo.