948523b80c
This PR adds `String? identifier` to `Semantics` and `SemanticsProperties`. The `identifier` will be exposed on Android as `resource-id` and on iOS as `accessibilityIdentifier`. Mainly targeted at #17988 Initial Engine PR with Android support: https://github.com/flutter/engine/pull/47961 iOS Engine PR: https://github.com/flutter/engine/pull/48858 ### Migration This change breaks the SemanticsUpdateBuilder API which is on the Framework<-->Engine border. For more details see [engine PR](https://github.com/flutter/engine/pull/47961). Steps: part 1: [engine] add `SemanticsUpdateBuilderNew` https://github.com/flutter/engine/pull/47961 **part 2: [flutter] use `SemanticsUpdateBuilderNew`** <-- we are here part 3: [engine] update `SemanticsUpdateBuilder` to be the same as `SemanticsUpdateBuilderNew`* part 4: [flutter] use (now updated) `SemanticsUpdateBuilder` again. part 5: [engine] remove `SemanticsBuilderNew`