feat(obs, net): Add Tempo service and enable dual-stack listener (#192)

This commit introduces two key enhancements: the integration of Grafana Tempo for distributed tracing and the implementation of a dual-stack TCP listener for improved network compatibility.

- **Observability**:
  - Adds the `tempo` service to the `docker-compose.yml` observability stack.
  - Tempo is configured to collect and store traces, integrating with the existing OpenTelemetry setup.
  - A custom `tempo-entrypoint.sh` script is included to manage volume permissions on startup.

- **Networking**:
  - Modifies `http.rs` to support dual-stack (IPv4/IPv6) connections on a single socket.
  - By setting the `IPV6_V6ONLY` socket option to `false`, the server can now accept both IPv6 and IPv4-mapped IPv6 traffic, enhancing cross-platform support.

rustfs/Cargo.toml

@@ -81,6 +81,7 @@ serde_json.workspace = true
 serde_urlencoded = { workspace = true }
 shadow-rs = { workspace = true, features = ["build", "metadata"] }
 socket2 = { workspace = true }
+sysctl = { workspace = true }
 thiserror = { workspace = true }
 tracing.workspace = true
 time = { workspace = true, features = ["parsing", "formatting", "serde"] }