Link to KB article or in-app message regarding Private Relay, Hide IP Address and Mail Privacy Protection

Same request as https://github.com/AdguardTeam/AdguardForMac/issues/1021

### Problem Description
Apple has introduced privacy measures which are affecting what AdGuard provides for our Apple devices.

- Hide IP Address and Mail Privacy Protection are enabled by default for trackers which will relay the traffic on a page or email as soon as a tracker is detected
- Private Relay will do this to a greater extent for all traffic

### Proposed Solution
Provide an informal in-app message that the user may wish to turn off Private Relay, Hide IP Address and Mail Privacy Protection on their iOS device to allow AdGuard to work to its full potential, just like in previous iOS versions prior to 15.

### Alternatives Considered
KB article regarding these privacy features and how to turn them off for AdGuard to continue working as expected (fully).