feat(storage): 新增WebDAV存储驱动

extend/think/filesystem/driver/Webdav.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace think\filesystem\driver;
+
+use League\Flysystem\FilesystemAdapter;
+use League\Flysystem\WebDAV\WebDAVAdapter;
+use Sabre\DAV\Client;
+use think\filesystem\Driver;
+
+class Webdav extends Driver
+{
+    protected function createAdapter(): FilesystemAdapter
+    {
+        $client = new Client([
+            'baseUri' => sysconfig('upload', 'webdav_url'),
+            'userName' => sysconfig('upload', 'webdav_username'),
+            'password' => sysconfig('upload', 'webdav_password'),
+        ]);
+
+        return new WebDAVAdapter($client, sysconfig('upload', 'webdav_prefix', ''));
+    }
+
+    public function url(string $path): string
+    {
+        return $this->concatPathToUrl(sysconfig('upload', 'webdav_domain'), $path);
+    }
+}