Rename 'type' to 'product_type' for coherency

Author: Raphael Santo Domingo

sdk/protos/product_state.proto

@@ -26,7 +26,7 @@ message Product {
   string identifier = 1;
 
   // What type of product is this (GS1)
-  ProductType type = 2;
+  ProductType product_type = 2;
 
   // Who owns this product (pike organization id)
   string owner = 3;

sdk/src/protocol/product/state.rs

@@ -90,7 +90,7 @@ impl FromProto<protos::product_state::Product> for Product {
     ) -> Result<Self, ProtoConversionError> {
         Ok(Product {
             identifier: product.get_identifier().to_string(),
-            product_type: ProductType::from_proto(product.get_field_type())?,
+            product_type: ProductType::from_proto(product.get_product_type())?,
             owner: product.get_owner().to_string(),
             product_values: product
                 .get_product_values()
@@ -106,7 +106,7 @@ impl FromNative<Product> for protos::product_state::Product {
     fn from_native(product: Product) -> Result<Self, ProtoConversionError> {
         let mut proto = protos::product_state::Product::new();
         proto.set_identifier(product.identifier().to_string());
-        proto.set_field_type(product.product_type().clone().into_proto()?);
+        proto.set_product_type(product.product_type().clone().into_proto()?);
         proto.set_owner(product.owner().to_string());
         proto.set_product_values(RepeatedField::from_vec(
             product.product_values()