Constant MAX_GRPC_MESSAGE_SIZE 

const MAX_GRPC_MESSAGE_SIZE: usize = usize::MAX; // 18_446_744_073_709_551_615usize

Max message size, used to configure gRPC servers and clients.

While max_encoding_message_size defaults to usize::MAX, max_decoding_message_size only defaults to 4MB, so we bump it to avoid protocol errors.