Package renaming in Jelly-JVM 3.0.0

[Ostrzyciel]

Up for discussion: in Jelly-JVM 3.0.0 we could consider renaming some packages/modules to better align with what these modules actually do:

• jelly-stream -> jelly-pekko-streams
• jelly-grpc -> jelly-pekko-grpc

The "stream" name part is a bit confusing, because it isn't "a module adding support for streams", but rather just an integration for Apache Pekko Streams. Another thing is that in the future we may have other modules with similar capabilities, so it would be very confusing if we had a module named jelly-stream. Same goes for gRPC.

To investigate: can we communicate this renaming somehow to Maven?