Add a new labels attribute to the Users collection

This labels attribute can be used apply labels to users. These labels
can eventually be used:

* with permissions to grant access
* to filter users in the Users collection

app/config/collections.php

@@ -1244,6 +1244,17 @@ $collections = [
                 'array' => false,
                 'filters' => [],
             ],
+            [
+                '$id' => ID::custom('labels'),
+                'type' => Database::VAR_STRING,
+                'format' => '',
+                'size' => 128,
+                'signed' => true,
+                'required' => false,
+                'default' => null,
+                'array' => true,
+                'filters' => [],
+            ],
             [
                 '$id' => ID::custom('passwordHistory'),
                 'type' => Database::VAR_STRING,

src/Appwrite/Utopia/Response/Model/User.php

@@ -77,6 +77,13 @@ class User extends Model
                 'default' => true,
                 'example' => true,
             ])
+            ->addRule('labels', [
+                'type' => self::TYPE_STRING,
+                'description' => 'Labels for the user.',
+                'default' => [],
+                'example' => ['vip'],
+                'array' => true,
+            ])
             ->addRule('passwordUpdate', [
                 'type' => self::TYPE_DATETIME,
                 'description' => 'Password update time in ISO 8601 format.',

tests/e2e/Services/Account/AccountBase.php

@@ -39,6 +39,7 @@ trait AccountBase
         $this->assertEquals(true, $dateValidator->isValid($response['body']['registration']));
         $this->assertEquals($response['body']['email'], $email);
         $this->assertEquals($response['body']['name'], $name);
+        $this->assertEquals($response['body']['labels'], []);
 
         /**
          * Test for FAILURE

tests/e2e/Services/Users/UsersBase.php

@@ -35,6 +35,7 @@ trait UsersBase
         $this->assertEquals($body['email'], 'cristiano.ronaldo@manchester-united.co.uk');
         $this->assertEquals($body['status'], true);
         $this->assertGreaterThan('2000-01-01 00:00:00', $body['registration']);
+        $this->assertEquals($body['labels'], []);
 
         /**
          * Test Create with Custom ID for SUCCESS