Roslyn analyzer for pubternal members

Some types and members in Sentry are public due to language limitations (like the fact that a public class cannot implement an internal interface with internal members) and are not meant to be used by users. Additionally, they may break in the future without a major version bump.

The suggestion is to add an attribute like [NotForPublicUse] or similar and embed a Roslyn analyzer that will aggressively fail builds if any of these types are used from anywhere except Sentry projects.

This might already exist somewhere, I didn’t research. However, even if an analyzer like that exists, we would want to embed it directly into main Sentry package, so it makes sense to make our own regardless.

[SimonCropp]

decided that we will settle on [EditorBrowsable(EditorBrowsableState.Never)] for cases when this is required.

[marandaneto]

we do something similar on Java/Android using Jetbrain’s annotation -> @ApiStatus.Internal