Avoid using flume::Receiver::into_stream() to avoid memory leaks until the issue is resolved upstream (#394)

* Tweak rolling_total test to also confirm capacity doesn't go nuts

* Use Jemalloc

* Avoid flume's into_stream and use a workaround for now

* cargo fmt

* Improve comments now that there's an issue to point to

backend/common/src/ws_client/connect.rs

@@ -205,7 +205,7 @@ impl Connection {
                 closer: Arc::clone(&on_close),
             },
             Receiver {
-                inner: rx_from_ws.into_stream(),
+                inner: crate::flume_receiver_into_stream(rx_from_ws),
                 closer: on_close,
             },
         )

backend/common/src/ws_client/receiver.rs

@@ -20,7 +20,7 @@ use std::sync::Arc;
 
 /// Receive messages out of a connection
 pub struct Receiver {
-    pub(super) inner: flume::r#async::RecvStream<'static, Result<RecvMessage, RecvError>>,
+    pub(super) inner: crate::FlumeRecvStream<'static, Result<RecvMessage, RecvError>>,
     pub(super) closer: Arc<OnClose>,
 }