pcreate with package- and module-based scaffolding

Currently pcreate support only project-based scaffolding.

This pull-request intends to add support of package- and module-based scaffolding.

The detail is illustrated in the following slides:

https://docs.google.com/presentation/d/1cMgBpxuNamqBbuLusHJk7J-6Cr9MbOjnC56zsKPigZs/edit#slide=id.g3903efc52_010