Bookmarks were only synced when devices were synced, but not when
bookmarks were added/removed/updated.
To account for this, there's are new messenger APIs in status-go
proposed here: https://github.com/status-im/status-go/pull/2709
Based on those APIs, desktop can now add/remove/update bookmarks and the
changes are automatically synced to other devices in real-time.
This commit also ensures that changes from other devices with regards to
bookmarks are handled and updated on the current device.
Partially addresses #5201
