Nucli refactor crate stream (#2828)

* nu-stream is building on its own, now clean up Cargo.toml

* replace the stream crate in nu-cli

* cc

* since we moved stream out of the nu-cli crate and into its own crate we need to remove pub(crate) and just make it pub

* clean up the prelude and hand merge everything together

* clean up Cargo.tom

* cargo fmt along with Cargo.lock

crates/nu-stream/src/interruptible.rs

@@ -0,0 +1,35 @@
+use crate::prelude::*;
+use futures::task::Poll;
+use std::sync::atomic::{AtomicBool, Ordering};
+
+pub struct InterruptibleStream<V> {
+    inner: BoxStream<'static, V>,
+    interrupt_signal: Arc<AtomicBool>,
+}
+
+impl<V> InterruptibleStream<V> {
+    pub fn new<S>(inner: S, interrupt_signal: Arc<AtomicBool>) -> InterruptibleStream<V>
+    where
+        S: Stream<Item = V> + Send + 'static,
+    {
+        InterruptibleStream {
+            inner: inner.boxed(),
+            interrupt_signal,
+        }
+    }
+}
+
+impl<V> Stream for InterruptibleStream<V> {
+    type Item = V;
+
+    fn poll_next(
+        mut self: std::pin::Pin<&mut Self>,
+        cx: &mut std::task::Context<'_>,
+    ) -> core::task::Poll<Option<Self::Item>> {
+        if self.interrupt_signal.load(Ordering::SeqCst) {
+            Poll::Ready(None)
+        } else {
+            Stream::poll_next(std::pin::Pin::new(&mut self.inner), cx)
+        }
+    }
+}