Allow scalar values for Query::select() (#292)

* Update tests according main PR

* Apply Rector changes (CI)

* Revert "Apply Rector changes (CI)"

This reverts commit 132fef7.

* Disable Rector for tests

* Add type string to test

---------

Co-authored-by: Tigrov <Tigrov@users.noreply.github.com>
Co-authored-by: Sergei Predvoditelev <sergei@predvoditelev.ru>

tests/QueryBuilderTest.php

@@ -770,4 +770,10 @@ public function testJsonColumn()
             $qb->insert('json_table', ['json_col' => new JsonExpression(['a' => 1, 'b' => 2])]),
         );
     }
+
+    /** @dataProvider \Yiisoft\Db\Sqlite\Tests\Provider\QueryBuilderProvider::selectScalar */
+    public function testSelectScalar(array|bool|float|int|string $columns, string $expected): void
+    {
+        parent::testSelectScalar($columns, $expected);
+    }
 }