Add observability using the tracing crate

tests/test_helper.rs

@@ -1,9 +1,18 @@
+use contextswitch_api::observability::{get_subscriber, init_subscriber};
 use contextswitch_api::taskwarrior;
 use mktemp::Temp;
+use once_cell::sync::Lazy;
 use std::fs;
 use std::net::TcpListener;
 
+static TRACING: Lazy<()> = Lazy::new(|| {
+    let subscriber = get_subscriber("info".to_string());
+    init_subscriber(subscriber);
+});
+
 pub fn spawn_app() -> String {
+    Lazy::force(&TRACING);
+
     let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
     let port = listener.local_addr().unwrap().port();