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feat(core): add Fn::GetStackOutput for cross-region references (#37724)
By default, the CDK only allows references between resources if they are in the same environment (account and region). But users can opt in to an experimental feature that allows cross-region, same-account references, by setting the `crossRegionReference` flag to `true` in the consumer stack. With this feature on, when there is a cross-region reference, the CDK generates two custom resources that communicate with each other via SSM parameters. A writer resource is deployed to the producer stack, and a reader resource is deployed to the consumer stack. So far, this was the best mechanism to "export" a value in the producer and "import" it in the consumer. But CloudFormation has now released a new intrinsic function, `Fn::GetStackOutput`, which, as the name suggests, gets the value of a arbitrary output. This function works cross-region and cross-account. This PR introduces support for these two use cases. ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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