Include pairingTopic in SessionRequest object

[ankudryavtsev]

Is your feature request related to a problem? Please describe. We'd like to match a request with a pairing to determine the source of the request (like a QR or a deep link).

Describe the solution you'd like Include pairingTopic in Wallet.Model.SessionRequest object to match them with a pairing topic

Describe alternatives you've considered

Additional context