Add mute option to android

[cammellos]

As an android user
I want to be able to mute a chat
So that I won't receive notifications from it

Description

We should allow users to mute a contact in the same way we do on IOS for Android.
If a contact is muted that way, we should not show notifications when receiving a message from them.

Technical details

Most of the changes are in status-go, there's already an endpoint that we use to mute chats/contacts, we just need to enable the UI in status-react and make sure that we don't show notifications for muted contacts, that's done in status-go.