Add TN option to receive/share provider

[oleggrib]

In case if developer have website option to connect wallet then can be helpful to let user pass provider or at least provider name and TN can use this provider to get walletAddress/signMessage . In this case UX will be improved and user avoid redundant wallet selection.

Same time would be great to add event when TN connected wallet, so page can use ready provider and dont ask user to connect wallet again.
cc @nicktaras