[Epic] Support moving resources between projects

[justinvp]

Sometimes would be useful to move some resource from one project stack to another project stack, without recreating the resource.

For example, split a monolithic stack to micro stacks.

Currently, the easiest way to move the code to the new stack and import it, then remove from the old stack manually with pulumi state delete or exporting the stack and removing the resource and every dependency.

This is a very error-prone process, pulumi should provide an easier way to do these kinds of refactorings.

Related issues: #3389

Design

• Write design doc

Implementation Plan

TODO

Announce

• Documentation updates for this new capability
• Write blog post
• 🍦