Add the ability to support default aliases in the bridge

[rshade]

Hello!

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Issue details

Like azure-native, we need aliases configured with the previous provider name(s). A resource of before:mod:resource moved to after:mod:resource would have the former type token as an alias, and the new after SDK would adopt the resources seamlessly.

Affected area/feature

[t0yv0]

Hi Richard I think there's some solid progress toward this in #784 , as it came up as an internal urgent need on the @pulumi/ecosystem team also. We'll work this out shortly with the final shape of the API and let you know.