v0.4.6

• Prepared metadata is now accessible for users.
• Rust edition is bumped to 2021.
• Prepared queries without proper partition key information (which may happen if not all partition key columns are bound markers) used to erroneously be routed to a single shard of a specific node, or group of nodes. This behavior is now fixed, and such queries are treated as unprepared queries - they go to a random node.
• Session initialization will now fail if control connections failed to establish; an error in fetching metadata is still not fatal, but if the control connection couldn't be established at all, it indicates that the session is not functional.