Refresh routing table using a separated thread

[madchicken]

As promised, here is a follow-up PR to fetch and update the routing table using a separated thread.
This pull request introduces significant changes to the routing and connection management within the lib/src directory, specifically focusing on the graph.rs, connection_registry.rs, and routed_connection_manager.rs files. The changes include adding a new RoutingTableProvider trait, implementing a ClusterRoutingTableProvider, and refactoring the connection registry and routed connection manager to support these updates.

Improvements to Routing and Connection Management:

• lib/src/graph.rs: Updated the RoutedConnectionManager initialization to include the new ClusterRoutingTableProvider and added debug logging for routing. [1] [2]

• lib/src/routing/connection_registry.rs: Refactored the ConnectionRegistry to remove expired update logic, added a background updater for refreshing the routing table, and introduced the RegistryCommand enum for controlling the updater. [1] [2] [3] [4] [5]

• lib/src/routing/mod.rs: Added the routing_table_provider module and updated the RoutingTable struct to derive Default. [1] [2] [3]

• lib/src/routing/routed_connection_manager.rs: Refactored the RoutedConnectionManager to use the new RoutingTableProvider and added methods for managing bookmarks. [1] [2] [3] [4] [5]

• lib/src/routing/routing_table_provider.rs: Introduced the RoutingTableProvider trait and implemented the ClusterRoutingTableProvider to handle fetching the routing table.

[knutwalker]

Thanks, greatly appreciate it! Happy to merge once my comment is resolved.