Hermes: Include iOS debug symbols in Hermes XCFramework
Hermes: Include iOS debug symbols in Hermes XCFramework

Summary:
Include dSYMs when building the universal XCFramework for Hermes iOS.

CocoaPods should pick up dSYMs automatically when using `vendored_framework` if:
- `hermes.framework` has a `hermes.framework.dSYM` in the same base directory
- `hermes.xcframework` has a `dSYMs` folder with a `hermes.framework.dSYM` in it, for each slice

The dSYMs for the macOS hermes.framework are already being created.

Changelog: [Internal]

Reviewed By: cipolleschi

Differential Revision: D40790250

fbshipit-source-id: 50fcb3492434637b00458c1aa443ac6ec5472fac

facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native