Sentry Integration (if consent provided)

Adds [Sentry](https://sentry.io/) as a monitoring tool to track app health metrics such as crashes and non-fatal issues. Using Sentry is subject to the same user consent as other crash and analytics data and is configurable from user settings.

Parity with web and iOS
https://github.com/matrix-org/matrix-react-sdk/pull/6597
https://github.com/vector-im/element-ios/pull/6308