Updated subtree from https://github.com/azure/azure-functions-language-worker-protobuf. Branch: dev. Commit:ed55563d9d83ca78c1d268aaf9e8deda1ee51cd2 (#268)

Author: pragnagopa

src/main/azure-functions-language-worker-protobuf/src/proto/FunctionRpc.proto

@@ -301,11 +301,21 @@ message BindingInfo {
       inout = 2;
     }
 
+    // Indicates the type of the data for the binding
+    enum DataType {
+      undefined = 0;
+      string = 1;
+      binary = 2;
+      stream = 3;
+    }
+
   // Type of binding (e.g. HttpTrigger)
   string type = 2;
 
   // Direction of the given binding
   Direction direction = 3;
+
+  DataType data_type = 4;
 }
 
 // Used to send logs back to the Host