This is an enhancement of the ServiceStub abstract class that makes
it more useful by making it possible to pass all arguments supported
by the underlying grpclib request function.
It extends to the existing high level API by allowing values to be
set on the stub instance, and the low level API by allowing values
to be set per call.
- Create one simple test for generated Service stubs in preparation
for making more changes in this area.
- Add dev dependency on pytest-asyncio in order to use ChannelFor
from grpclib.testing more easily.
- Create a new example proto containing a minimal rpc example.
Nat Noordanus
