Add Cart component and cart view for billing portal

app/Livewire/BillingPortal/Cart/Cart.php

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+<?php
+
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2022. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace App\Livewire\BillingPortal\Cart;
+
+use App\Libraries\MultiDB;
+use App\Models\Subscription;
+use Livewire\Component;
+
+class Cart extends Component
+{
+    public Subscription $subscription;
+
+    public array $context;
+
+    public function handleSubmit()
+    {
+        $this->dispatch('purchase.next');
+    }
+
+    public function render()
+    {
+        return view('billing-portal.v3.cart.cart');
+    }
+}

resources/views/billing-portal/v3/cart/cart.blade.php

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+<div>
+    <livewire:billing-portal.cart.recurring-products
+        :subscription="$subscription"
+        :context="$context"
+    />
+
+    <livewire:billing-portal.cart.one-time-products
+        :subscription="$subscription"
+        :context="$context"
+    />
+
+    <livewire:billing-portal.cart.optional-recurring-products
+        :subscription="$subscription"
+        :context="$context"
+    />
+
+    <livewire:billing-portal.cart.optional-one-time-products
+        :subscription="$subscription"
+        :context="$context"
+    />
+
+    <div class="mt-3">
+        <form wire:submit="handleSubmit">
+            <button
+                type="submit"
+                class="button button-block bg-primary text-white mt-4"
+            >
+                {{ ctrans('texts.next') }}
+            </button>
+        </form>
+    </div>
+</div>