download_task.sql created in a public folder

**Describe the bug**
In iOS, we set the download path using [getApplicationDocumentsDirectory()](https://pub.dev/documentation/path_provider/latest/path_provider/getApplicationDocumentsDirectory.html) and apply some configs in order for the downloaded file to be accessible for the user (as described in https://stackoverflow.com/a/56409320).
This method works fine, the file is downloaded and the user can see it and open it.

The problem is that the plugin also creates another file in this directory. This file is download_task.sql and is internal to the plugin, and should not be visible for the user.

I'm not an ios developer myself so I asked an ios developer for an analysis and he said that the plugin is doing some incorrectly:

```

> NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)

should be

> NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES)

```

**Device information:**

- Device: iPhone 12 Pro Max
- OS: iOS 15.5
- plugin version 1.8.3+2