remove: unused UID validator

src/Appwrite/Utopia/Database/Validator/UID.php

@@ -1,70 +0,0 @@
-<?php
-
-namespace Appwrite\Utopia\Database\Validator;
-
-use Utopia\Validator;
-
-class UID extends Validator
-{
-    /**
-     * Get Description.
-     *
-     * Returns validator description
-     *
-     * @return string
-     */
-    public function getDescription(): string
-    {
-        return 'Invalid UID format';
-    }
-
-    /**
-     * Is valid.
-     *
-     * Returns true if valid or false if not.
-     *
-     * @param mixed $value
-     *
-     * @return bool
-     */
-    public function isValid($value): bool
-    {
-        if ($value === 0) { // TODO Deprecate confition when we get the chance.
-            return true;
-        }
-
-        if (!is_string($value)) {
-            return false;
-        }
-        
-        if (mb_strlen($value) > 32) {
-            return false;
-        }
-
-        return true;
-    }
-
-    /**
-     * Is array
-     *
-     * Function will return true if object is array.
-     *
-     * @return bool
-     */
-    public function isArray(): bool
-    {
-        return false;
-    }
-
-    /**
-     * Get Type
-     *
-     * Returns validator type.
-     *
-     * @return string
-     */
-    public function getType(): string
-    {
-        return self::TYPE_STRING;
-    }
-}