[11.x] Add path method to Illuminate\Contracts\Filesystem\Filesystem interfa… (#49525)

* Add path method to Illuminate\Contracts\Filesystem\Filesystem interface to prevent error in Storage Facade

* Update Filesystem.php

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: habibendris

src/Illuminate/Contracts/Filesystem/Filesystem.php

@@ -18,6 +18,14 @@ interface Filesystem
      */
     const VISIBILITY_PRIVATE = 'private';
 
+    /**
+     * Get the full path to the file that exists at the given relative path.
+     *
+     * @param  string  $path
+     * @return string
+     */
+    public function path($path);
+
     /**
      * Determine if a file exists.
      *