feat(monitoring): add pulse

- Added a new gate called `viewPulse` in the `AuthServiceProvider` class.
- The gate allows only admin users to view the Pulse feature.

database/migrations/2023_12_01_211507_add_admin_to_users.php

@@ -0,0 +1,21 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->boolean('admin')->default(false);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropColumn('admin');
+        });
+    }
+};