Add and use new Signals struct (#13314)

# Description
This PR introduces a new `Signals` struct to replace our adhoc passing
around of `ctrlc: Option<Arc<AtomicBool>>`. Doing so has a few benefits:
- We can better enforce when/where resetting or triggering an interrupt
is allowed.
- Consolidates `nu_utils::ctrl_c::was_pressed` and other ad-hoc
re-implementations into a single place: `Signals::check`.
- This allows us to add other types of signals later if we want. E.g.,
exiting or suspension.
- Similarly, we can more easily change the underlying implementation if
we need to in the future.
- Places that used to have a `ctrlc` of `None` now use
`Signals::empty()`, so we can double check these usages for correctness
in the future.

crates/nu-command/src/random/dice.rs

@@ -78,7 +78,7 @@ fn dice(
         Value::int(thread_rng.gen_range(1..sides + 1) as i64, span)
     });
 
-    Ok(ListStream::new(iter, span, engine_state.ctrlc.clone()).into())
+    Ok(ListStream::new(iter, span, engine_state.signals().clone()).into())
 }
 
 #[cfg(test)]