phinx中id字段设置为auto_increment，biginteger方法

如下，需要注意的是identity字段，而不是auto_increment。

$table = $this->table('test', ['id' => false, 'primary_key' => 'id']);
        $table->addColumn('id', 'biginteger', ['null' => false, 'signed' => false, 'identity' => true])
            ->addColumn('title', 'string', ['limit' => 50, 'null' => false])
            ->addColumn('created_at', 'datetime', ['null' => false])
            ->create();

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