feat(ios): add telemetry for feature use

**Is your feature request related to a problem? Please describe.**

We would like to know how much certain features in iOS are used. In particular, we are investigating use of the in-app browser in order to determine how much effort we need to put into ongoing support for it.

**Describe the solution you'd like**

Add Sentry info-level messages reporting when specific features are opened. Initially, need only support the browser.

See #5019 for Android version of this feature

---

**Keyman for iPhone/iPad/Android:**
- Device: iOS devices
- OS: iOS
- Keyman version: 15.0