This commit moves chats to status-go.
I have changed the logic to load all chats in one go for simplicity and
while that might have a performance impact, I think it's premature to
optimize this flow as there will be more changes to the login flow.
Also currently this is likely to be slower as we need to wait for the
status-service to be initialized, as well as realm.
No migration is provided as we are past the point of no return, so by
installing this version you will lose your chats.
Signed-off-by: Andrea Maria Piana <andrea.maria.piana@gmail.com>