Client interactive deal flow should support setting the verified flag

[arajasek]

This is currently a TODO in the code. We should probably check if the sender a is a verified client

		// Check if the address is a verified client
		dcap, err := api.StateVerifiedClientStatus(ctx, a, types.EmptyTSK)
		if err != nil {
			return err
		}

		isVerified := dcap != nil

If they are, and they have enough data in their cap for the deal in question, we should ask if they'd like to make it verified.