Add how much space an app takes up on the user's device

### Problem Statement

In the iOS settings (General -> Storage) I can see how much space an app takes up. This is split into:

- App Size
- Documents & Data

The use case is, that I can see if the app creates too much data or if I don't properly clean up data.

Relates to https://github.com/getsentry/sentry-java/issues/1917

### Solution Brainstorm

_No response_