Allow users to easily disconnect Keplr from PSM and wallet

[otoole-brendan]

It is expected behavior that a user can just as easily disconnect their wallet from PSM dapp and wallet as they can connect with the click of a button.

Some users want to break the connection and disconnect after their transaction (presumably for security reasons). This can be seen on Osmosis (Sign Out), Crescent (Disconnect), Gravity Bridge and Axelar bridge (Disconnect).

Proposed Design:
PSM: Once connection is made, button defaults to signal connection but operable word is 'Disconnect' (Gravity bridge behavior). Alternatively, a user can click 'Keplr Connected' to automatically disconnect or alternatively, present another option to 'Disconnect'.

Wallet: One user is suggesting the option be near purse. I know users can remove the Dapp connection under 'Dapps' tab but I think it make sense to offer a disconnect button from Dashboard given that's where user's will be spending most of their time interacting with wallet. Quick/Easy disconnection is the goal.