Add more logging to indicate when user function is invoked from the python worker #634
Description
User code is invoked here: https://github.com/Azure/azure-functions-python-worker/blob/dev/azure_functions_worker/dispatcher.py#L312-L317
- Add logging for both async and sync function invocations.
- Also, add logs as soon as python worker receives a message on the grpc channel.
Do make sure to send system logs via gRpc using System log category- https://github.com/Azure/azure-functions-language-worker-protobuf/blob/dev/src/proto/FunctionRpc.proto#L391