Including grpclib to the common requirements and generating async Python code from protobuf

grpcio==1.47.*

grpcio-health-checking==1.47.*

grpcio-tools==1.47.*

grpclib[protobuf]

prettytable==3.5.0

prometheus-client==0.13.0

protobuf==3.20.*

# Generate Python code

python3 -m grpc_tools.protoc -I=./ --python_out=src/python/ --grpc_python_out=src/python/ *.proto

# new line added to generate protobuf for the `grpclib` library

python3 -m grpc_tools.protoc -I=./ --python_out=src/python/asyncio --grpclib_python_out=src/python/asyncio *.proto

# Arrange generated code imports to enable imports from arbitrary subpackages

find src/python -type f -iname *.py -exec sed -i -E 's/(import\ .*)_pb2/from . \1_pb2/g' {} \;