Investigate moving self-addressed messages to separate shard

[plopezlpz]

Backup/sync messages are self-addressed messages, those might be increasing bandwidth in shard 32, it could be advantageous to post them into a separate shard (e.g.: 128) via light-push and get them using store query.

The goal is to reduce bandwidth in the shard used for content messages where status desktop nodes would be participating in relay.

Also track the bandwidth saved, there is a PR that will record the bandwidth by message type here:
https://github.com/status-im/telemetry/pull/74/files
Once merged we could ideally see the gains of moving self-addressed messages to a different shard