Feature: Bool variable that will tell us if user has supported wallet installed

Feature:
It would be nice to have something like Web3.CanLogin() which will return true if user has a supported wallet installed and false if he doesn't for example I didn't have any wallet installed on my test phone and nothing was happening when I tried to connect, I had to open logcat and see what was the problem

If we had something like Web3.CanLogin() we cloud show a nice popup to user instead of wrapping the call in try catch to achieve same result

No files or tests are named. Start by locating the Web3 connection entry point and the existing supported-wallet failure path, then determine how wallet availability can be exposed; done means callers can check availability and show a user-facing alternative instead of relying on logcat or try/catch.

Written by the indexing model from the issue text.