Better support for multiple CDK Stacks and Environments

[corymhall]

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Issue details

If you want to create an application with multiple CDK Stacks across multiple environments (e.g. Stack1 in us-east-1 and Stack2 in us-east-2) it is not easy to do.

By default we create a defaultStackSynthesizer at the App level which means that it applies to all Stacks within that application. Currently the PulumiSynthesizer inherits the providers from the App level environment so if there are Stacks that do not use this default environment you have to pass your own PulumiSynthesizer to the App.

We need to ideally create separate staging resources per Stack environment.

Affected area/feature