request: Add a CheckConnection method

[RezaRahemtola]

While integrating Adena in my project, I thought that it could be great to have an "autoconnect" feature just like in Ethereum with wagmi.

Currently I have no way of implementing this, as it's the AddEstablish method that returns a type of ALREADY_CONNECTED, but calling this will prompt the user to connect his wallet if it isn't connected.

Having a method for this would be great, for example CheckConnection that would not prompt the user to establish a connection but simply return the status (so if it's already connected, the frontend can fetch the account information to auto connect the user, else wait for the user to click a button in the UI).