Description

The default of SentryFrame.function is <redacted> which makes no sense. We don't do this in other SDKs, such as Java for example. The Cocoa SDK doesn't symbolcate function names locally mostly because it's slow, and it usually doesn't work for app store builds. When the SDK can't detect the function name, instead it should keep it set to nil and let the backend set a potential <redacted>. This is a breaking change, though.

This came up while investigating getsentry/sentry#52851 (comment).