UTM

Add parameters to identify the campaigns that directs traffic.

This feature can be used:

Create object in sdk storage with key ”key” and value “value” for that key.

```swift
OcambaHoood.setUtm("key", "value")
```

Get object for key “key” from sdk storage:

```swift
OcambaHoood.getUtm("key")
```

Remove value for key “key” from sdk storage:

```swift
OcambaHoood.removeUtm("key")
```