Update cart-transform examples to match API changes and add shopify_function rust crate

Author: Ryan Workman

checkout/rust/cart-transform/bundles/.gitignore

@@ -1,2 +1,3 @@
 /target
 Cargo.lock
+.output.graphql

checkout/rust/cart-transform/bundles/Cargo.toml.liquid

@@ -1,12 +1,16 @@
 [package]
-name = "bundle_cart_transform"
+name = "bundles_cart_transform"
 version = "1.0.0"
 edition = "2021"
 
 [dependencies]
-serde_json = "1.0"
 serde = { version = "1.0.13", features = ["derive"] }
+serde_with = "1.13.0"
+serde_json = "1.0"
+shopify_function = "0.2.4"
+graphql_client = "0.12.0"
 
 [profile.release]
 lto = true
 opt-level = 's'
+strip = true

checkout/rust/cart-transform/bundles/input.graphql.liquid

@@ -4,6 +4,7 @@ query Input {
       id
       quantity
       merchandise {
+        __typename
         ... on ProductVariant {
           id
           component_parents: metafield(
@@ -24,6 +25,12 @@ query Input {
           ) {
             value
           }
+          price_adjustment: metafield(
+            namespace: "custom"
+            key: "price_adjustment"
+          ) {
+            value
+          }
         }
       }
     }