Accompanying framework PR: https://github.com/flutter/flutter/pull/138331
This PR implements support for exposing `SemanticsProperties.identifier` on Android as `resource-id`. Mainly targeted at https://github.com/flutter/flutter/issues/17988. Would also fix https://github.com/flutter/flutter/issues/issues/137735 but it was marked as duplicate. Anyway, there's a lot of context in that issue.
This PR requires changing the `SemanticsUpdateBuilder` interface (defined in engine) that framework depends on, so it requires introducing a temporary API ([see question I asked on Discord](https://discord.com/channels/608014603317936148/608018585025118217/1174845658033819729) to learn more about this approach).
Steps:
**part 1: [engine] add `SemanticsUpdateBuilderNew`** <-- we are here
part 2: [flutter] use `SemanticsUpdateBuilderNew`
part 3: [engine] update `SemanticsUpdateBuilder` to be the same as `SemanticsUpdateBuilderNew`*
part 4: [flutter] use (now updated) `SemanticsUpdateBuilder` again.
part 5: [engine] remove `SemanticsBuilderNew`
I'd like to do these changes first, and only then continue with [the proper framework PR](https://github.com/flutter/flutter/pull/138331).
*More specifically: update `SemanticsUpdateBuilder.updateNode()` to be the same as `SemanticsUpdateBuilderNew.updateNode()`. Number of arguments that function takes is the only change.
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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