These tests cover the same scenarios that are coverted in the engine's
unit tests, but exercise the Node SDK's marshalling paths.
These changes include a few enhancements to the Node SDK's test APIs
that make it easier to more precisely control its behavior, and extend
the `Mocks` interface to allow the registration of component resources
to work properly.
Contributes to #5943.
These changes add support for mocking the resource monitor to the NodeJS
and Python SDKs. The proposed mock interface is a simplified version of
the standard resource monitor that allows an end-user to replace the
usual implementations of ReadResource/RegisterResource and Invoke with
their own. This can be used in unit tests to allow for precise control
of resource outputs and invoke results.
