Completely restored authorization_code grant for user side.

Reworked oauth_sessions table.
Added extension to use MariaDB's JSON columns.
Rewritten tests for authorization_code grant for client side.
Deprecate some old shit.
[skip ci]

common/components/Redis/Set.php

@@ -5,6 +5,9 @@ use ArrayIterator;
 use IteratorAggregate;
 use Yii;
 
+/**
+ * @deprecated
+ */
 class Set extends Key implements IteratorAggregate {
 
     public function add($value): self {