Ability to configure uploads on select SSIDs (or simplify metered connectivity)

### Actual behaviour
-upload starts on active WIFI connection

### Expected behaviour
-it should be possible to exclude certain ~~URL's~~ SSIDs like
-- Hot Spots
-- Internet services in airplanes (Emirates)
-- other "expensive" (money, restricted bandwidth) services

### Steps to reproduce
1.
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### Environment data
Android version:

Device model:

Stock or customized system:

Nextcloud app version:

Nextcloud server version:

### Logs
#### Web server error log
```
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```

#### Nextcloud log (data/nextcloud.log)
```
Insert your Nextcloud log here
```
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