Add bundle price per component rust example

sample-apps/bundles-price-per-component/extensions/price-per-component-rs/.gitignore

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+/target
+Cargo.lock

sample-apps/bundles-price-per-component/extensions/price-per-component-rs/Cargo.toml

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+[package]
+name = "cart-transform-3-rust"
+version = "1.0.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0.13", features = ["derive"] }
+serde_json = "1.0"
+shopify_function = "0.8.1"
+graphql_client = "0.14.0"
+
+[profile.release]
+lto = true
+opt-level = 'z'
+strip = true

sample-apps/bundles-price-per-component/extensions/price-per-component-rs/README.md

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+---
+name: Cart Transform # LLM prompt for the example
+api_name: cart_transform
+api_version: 2025-01
+url: https://shopify.dev/docs/api/functions/2025-01/cart-transform
+example_name:  Cart Transform Expand Operation Bundle Expansion
+example_description: This function implements a bundle expansion using the cart transform expand operation.
+---
+
+# Cart Transform Expand Operation Example: Bundle Expansion
+
+This example demonstrates how to implement a bundle expansion using the Cart Transform expand operation. When a customer adds a bundle product to their cart, it's automatically expanded into its individual components. For example, a "Holiday Package" bundle could be expanded into three separate products, each with its own price.
+
+## How it Works
+
+1. A customer adds a bundle product to their cart (e.g., "Holiday Package")
+2. The cart transform function reads the bundle configuration from the product's metafields
+3. The single cart line is expanded to show all component products with their respective prices
+
+## Implementation Details
+
+The function works by:
+1. Checking each cart line for bundle configuration in the product's metafields
+2. When found, it expands the cart line to include all component products
+3. Each component is added as a separate line item with its specified price
+4. The prices are adjusted according to the presentment currency rate

sample-apps/bundles-price-per-component/extensions/price-per-component-rs/locales/en.default.json

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+{
+  "name": "cart-transform-3-rust",
+  "description": "cart-transform-3-rust"
+}