Tentative / Partial fix for scoping withAnimation()

[tifroz]

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• OPTIONAL: I have tested my change on an iOS simulator or device
• OPTIONAL: I have tested my change on an Android emulator or device
• REQUIRED: I have checked whether this change requires a corresponding update in the Skip Fuse UI repository (link related PR if applicable)
• OPTIONAL: I have added an example of any UI changes in the Showcase sample app

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The purpose of this PR is to support a discussion around the need for transpiler improvements

See issue #402 for details

This PR is not standalone

it depends on:

• this skip-model PR
• this skip-android-bridge PR
• transpiler improvements (not implemented, see withAnimation() leaks into global state on Android #402)