viest

Feat flush view data

2

The view data keeps appending causing memory to increase. For example. There is a timed task to send emails, I send 100 emails with different data, the view data length...

```php $userInstance = new User; $value = [ [ 'id' => 1, 'json' => '{}' ] , [ 'id' => 5, 'json' => '{"key":"values"}' ] , ]; $index = 'id';...

Compared to PHP7 json_encode and json_decode, it still has a good performance advantage, so it should be compatible with PHP7.x

### This issue is unique. - [X] I have used the [search tool](https://github.com/ONLYOFFICE/DocumentServer/issues?q=) and did not find an issue describing my bug. ### Operating System of DocumentServer Docker ### Version...