chore: wallet connect start/stop api

[friofry]

status-im/status-app#19952 (comment)

WDYT of adding startWC/stopWC APIs? We'll probably need to manually manage the WS connection on Android when the app is not in foreground. It can be a separate task.
On Android we'll run status-go as a service. This means the app can be killed, but status-go still running and it doesn't make much sense to have the WS connection running while the app is in the background or killed.
It seems IOS kills it automatically.