Increase grpc max message size

[pragnagopa]

Functions Host is updated to send command line argument: --grpcMaxMessageLength
Python worker needs to be updated to set this value for grpc.max_send_message_length and grpc.max_receive_message_length on the channel

[pragnagopa]

@1st1 / @elprans - We are rolling out functions runtime soon. It would be good to have the change on the worker sooner to support working with large blobs
cc: @asavaritayal

[elprans]

@pragnagopa Can you point me to the Host artifact that contains this please?

[pragnagopa]

Here is the dev build from the host: build/2.0.11709/artifacts . Please let me know if you cannot access it.

[elprans]

Just to confirm, does 11709 also contain the enable_content_negotiation (#101) bit?

[pragnagopa]

Yes. You can use these for proto changes as well!