redact screenshots via view hierarchy

[martinhaintz]

:scroll: Description

Switching to View Hierarchy for screenshot generation.

:bulb: Motivation and Context

close #1956

:green_heart: How did you test it?

Example App and Unittests

:pencil: Checklist

• [x] I reviewed submitted code
• [x] I added tests to verify changes
• [x] No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• [ ] I updated the docs if needed
• [x] All tests passing
• [ ] No breaking changes