WIP: Enhance tracing in Peer

- Add a bunch of events to Peer's async connection handling logic
- Use an EnvFilter to allow more control over the verbosity level of tracing on a per-module basis
- Wire up logging to emit trace events (we actually probably want to do this the other way around)

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

crates/rpc/Cargo.toml

@@ -28,6 +28,7 @@ rand = "0.8"
 rsa = "0.4"
 serde = { version = "1", features = ["derive"] }
 smol-timeout = "0.6"
+tracing = "0.1.34"
 zstd = "0.9"
 
 [build-dependencies]