Added ecommerce example implementation (#458)

* Fixed sdkVersion property that is reported to the backend

* Added example implementation of ecommerce order tracking

* Removed old objective c implementation

Example/ios/iOS Example/EcommerceViewController.swift

@@ -0,0 +1,49 @@
+//
+//  EcommerceViewController.swift
+//  iOSExampleApp
+//
+//  Created by Cornelius Horstmann on 05.09.24.
+//  Copyright © 2024 Mattias Levin. All rights reserved.
+//
+
+import UIKit
+import MatomoTracker
+
+class EcommerceViewController: UIViewController {
+    @IBOutlet weak var itemCountStepper: UIStepper!
+
+    @IBOutlet weak var numberOfItemsTextField: UITextField!
+    @IBOutlet weak var totalCostLabel: UILabel!
+    @IBOutlet weak var taxLabel: UILabel!
+    @IBOutlet weak var shippingCostLabel: UILabel!
+
+    private var total: Double {
+        itemCountStepper.value * 3.0
+    }
+    private var tax: Double {
+        total * 0.3
+    }
+    private var shipping: Double {
+        max(1, itemCountStepper.value / 3.0) * 0.1
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        MatomoTracker.shared.track(view: ["menu","ecommerce"])
+    }
+
+    @IBAction func itemCountValueChanged(_ stepper: UIStepper) {
+        numberOfItemsTextField.text = String(format: "%.0f", stepper.value)
+
+        totalCostLabel.text = String(format: "%.2f", total)
+        taxLabel.text = String(format: "%.2f", tax)
+        shippingCostLabel.text = String(format: "%.2f", shipping)
+    }
+
+    @IBAction func purchaseButtonTapped(_ sender: Any) {
+        let orderItem = OrderItem(sku: "SKU123", name: "Cookies", category: "Food", price: 1.0, quantity: Int(itemCountStepper.value))
+        MatomoTracker.shared.trackOrder(id: "Trans-\(arc4random_uniform(1000))", items: [orderItem], revenue: Float(total))
+    }
+
+}
+