Make Customer public so fake() can be found

As Fakes is on a different framework, the Customer object cannot be found due to its default internal access control. Catched this when CI ran tests.

Author: iamgabrielma

Fakes/Fakes/Networking.generated.swift

@@ -184,7 +184,7 @@ extension CreateProductVariation {
 extension Customer {
     /// Returns a "ready to use" type filled with fake values.
     ///
-    static func fake() -> Customer {
+    public static func fake() -> Customer {
         .init(
             customerID: .fake(),
             email: .fake(),

Networking/Networking/Model/Customer.swift

@@ -4,25 +4,25 @@ import Codegen
 /// Represents a Customer entity:
 /// https://woocommerce.github.io/woocommerce-rest-api-docs/#customer-properties
 ///
-struct Customer: Codable, GeneratedCopiable, GeneratedFakeable {
+public struct Customer: Codable, GeneratedCopiable, GeneratedFakeable {
 
     /// Unique identifier for the customer
-    let customerID: Int64
+    public let customerID: Int64
 
     /// The email address for the customer
-    let email: String
+    public let email: String
 
     /// Customer first name
-    let firstName: String?
+    public let firstName: String?
 
     /// Customer last name
-    let lastName: String?
+    public let lastName: String?
 
     /// List of billing address data
-    let billing: Address?
+    public let billing: Address?
 
     /// List of shipping address data
-    let shipping: Address?
+    public let shipping: Address?
 
     /// Customer struct initializer
     ///