Replace nanomsg with a proper message queue

[0xB10C]

Nanomsg is currently used by the extractor to publish messages to tools who subscribe to a TCP socket. Nanomsg has a few downsides:

• Only one publisher can exist, we might want to have multiple (a tracing publisher, and a RPC publisher, possibly a ZMQ publisher, ...)
• The nanomsg crate isn't maintained. The last update was 6 years ago..
• We can't easily record and play back messages, other message queues with brokers allow this

[0xB10C]

One solution could be NATS. It allows for:

• multiple publishers
• the async Rust client is maintained: https://github.com/nats-io/nats.rs
• and NATS JetStreams allow for recording and replay of messages