feat: support custom modules for Pulumi

[janaka]

Is your feature request related to a problem? Please describe.
The current API for custom modules is not compatible with Pulumi because of differences between CDK and Pulumi. Unlike CDK, Pulumi doesn't support changing or adding the config of ComponentResources via properties. There's method that can be called on instances either. AFAIK the only way is through the args param through the constructor.

Describe the solution you'd like
TBD how to change the API. But the outcome is to support custom modules for Pulumi.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
The sample Pulumi project (currently on a branch) has the outline of a custom module. So a good starting point to understand the situation.