Summary:
This pull request makes properties of events' Flow types in `AndroidTextInputNativeComponent` be `$ReadOnly`.
This will make them more compatible with the callback types in `TextInput`.
## Changelog
[Internal] [Changed] - Made properties of events' Flow types in `AndroidTextInputNativeComponent` readonly
Pull Request resolved: https://github.com/facebook/react-native/pull/26469
Test Plan:
`yarn flow-check-ios` and `yarn flow-check-android` both pass.
No regressions to running `scripts/generate-rncore.sh` have been noted.
Differential Revision: D17435579
Pulled By: TheSavior
fbshipit-source-id: 92e6c0623c4dd3fe06ebfb22dc73916bf5917bcc