fix: add address and customer metadata to tax calc context (#10122)

Fixes CMRC-713

**What**
- Ensure that customer and shipping address metadata is passed in the tax calculation context when updating tax lines on a cart.

**Why**
- Gives more flexibility in criteria to evaluate tax rates. 
- https://github.com/medusajs/medusa/discussions/10121
- https://github.com/medusajs/medusa/discussions/10114

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/core/core-flows/src/cart/workflows/update-tax-lines.ts

@@ -47,6 +47,7 @@ const cartFields = [
   "shipping_methods.amount",
   "customer.id",
   "customer.email",
+  "customer.metadata",
   "customer.groups.id",
   "shipping_address.id",
   "shipping_address.address_1",
@@ -56,6 +57,7 @@ const cartFields = [
   "shipping_address.country_code",
   "shipping_address.region_code",
   "shipping_address.province",
+  "shipping_address.metadata",
 ]
 
 export type UpdateTaxLinesWorkflowInput = {

packages/core/core-flows/src/tax/steps/get-item-tax-lines.ts

@@ -53,6 +53,7 @@ function normalizeTaxModuleContext(
     id: orderOrCart.customer.id,
     email: orderOrCart.customer.email,
     customer_groups: orderOrCart.customer.groups?.map((g) => g.id) || [],
+    metadata: orderOrCart.customer.metadata,
   }
 
   return {
@@ -63,6 +64,7 @@ function normalizeTaxModuleContext(
       address_2: address.address_2,
       city: address.city,
       postal_code: address.postal_code,
+      metadata: address.metadata,
     },
     customer,
     is_return: isReturn ?? false,