Exit with error if any thread panics

The threads we run  are crucial for the profiler to work correctly. They
should never panic (and we should ensure that's the case) but if a panic
occurs, hard stopping is better.

Test Plan
=========

panicked a thread and the main thread exited.

src/main.rs

@@ -1,10 +1,15 @@
+use std::error::Error;
+use std::path::PathBuf;
+use std::time::Duration;
+use std::panic;
+use std::fmt::Write;
+use std::fs::File;
+use std::ops::RangeInclusive;
+
 use clap::ArgAction;
 use clap::Parser;
 
 use inferno::flamegraph;
-use std::fmt::Write;
-use std::fs::File;
-use std::ops::RangeInclusive;
 use tracing::Level;
 use tracing_subscriber::fmt::format::FmtSpan;
 use tracing_subscriber::FmtSubscriber;
@@ -14,10 +19,6 @@ use lightswitch::object::build_id;
 use lightswitch::profiler::Profiler;
 use lightswitch::unwind_info::{compact_printing_callback, UnwindInfoBuilder};
 use primal::is_prime;
-use std::error::Error;
-use std::path::PathBuf;
-
-use std::time::Duration;
 
 const SAMPLE_FREQ_RANGE: RangeInclusive<usize> = 1..=1009;
 
@@ -82,7 +83,19 @@ struct Cli {
     flamegraph_file: PathBuf,
 }
 
+/// Exit the main thread if any thread panics. We prefer this behaviour because pretty much every
+/// thread is load bearing for the correct functioning.
+fn panic_thread_hook() {
+    let orig_hook = panic::take_hook();
+    panic::set_hook(Box::new(move |panic_info| {
+        orig_hook(panic_info);
+        std::process::exit(1);
+    }));
+}
+
 fn main() -> Result<(), Box<dyn Error>> {
+    panic_thread_hook();
+
     let args = Cli::parse();
 
     let subscriber = FmtSubscriber::builder()