feat: add prefix-without-leading-slash to s3 URLs

In previous versions, when a prefix is set in flysystem+s3 urls, it preservers a leading slash as first character.
In S3 this is not desirable, since it will add a directory with "/" an URLs will result in double slash https://bucket.s3-domain//prefix/...

Since this cannot be fixed without getting a BC, we add a parameter to get a correct behavior.

Author: josuealcalde-utamed

src/Filesystem/Flysystem/AdapterFactory.php

@@ -176,7 +176,7 @@ private static function createS3Adapter(array $parsed): FilesystemAdapter // @ph
                     'accessKeySecret' => $parsed['pass'] ?? null,
                 ]),
                 $parsed['host'] ?? throw new \InvalidArgumentException('A bucket must be set as the host.'), // bucket
-                $parsed['path'] ?? '', // prefix
+                isset($parse['query']['prefix-without-leading-slash']) ? preg_replace('/^\//', '', $parsed['path'] ?? '') : ($parsed['path'] ?? ''), // prefix
             );
         }
 
@@ -191,7 +191,7 @@ private static function createS3Adapter(array $parsed): FilesystemAdapter // @ph
                     'version' => $parsed['query']['version'] ?? 'latest',
                 ]),
                 $parsed['host'] ?? throw new \InvalidArgumentException('A bucket must be set as the host.'), // bucket
-                $parsed['path'] ?? '', // prefix
+                isset($parsed['query']['prefix-without-leading-slash']) ? preg_replace('/^\//', '', $parsed['path'] ?? '') : ($parsed['path'] ?? ''), // prefix
             );
         }