feat: introduce routing info concept

[weboko]

Description

Concepts are being mixed up between the global network config (static vs auto sharding), that needs to be the same of all nodes in the network, individual node configuration (eg relay node subscribing to a given shard), and the routing characteristic of a specific message (eg pubsub topic, shard).

Proposed Solution / Feature Design

Routing info abstract pubsub topic, shard, and autosharding needs. Which should lead to easier tidy up of the pubsub concept at a later stage.