Dependencies of dependencies

[aatarasoff]

As a developer, I must manually define all dependencies now. If module A is dependent on module B, and module B is dependent on module C, then as a developer, one must define modules B and C as dependencies in module A.

In order to support transitive dependencies, there are two types of dependencies: direct and indirect. A direct dependency means that module A can't be compiled without module C. On the other hand, an indirect dependency means that module A can be compiled without module C. This is common when module B simply uses module C to create a gRPC client to call.

Therefore, we should only resolve direct dependencies and vendor them.