Remove overzealous clippy overrides

We have overridden a number of clippy warnings such as
"large enum variant".

Considering that we have a number of issues
 with the stack size in CI, it is more prudent to follow clippy's advice
 and box larger items so that the enum does not take larger space.

Do note that an instance of the enum always takes as much space as its
largest variant.

swap/src/alice.rs

@@ -53,15 +53,15 @@ pub fn new_swarm(
     Ok(swarm)
 }
 
-#[allow(clippy::large_enum_variant)]
 #[derive(Debug)]
 pub enum OutEvent {
     ConnectionEstablished(PeerId),
     // TODO (Franck): Change this to get both amounts so parties can verify the amounts are
     // expected early on.
-    Request(amounts::OutEvent), // Not-uniform with Bob on purpose, ready for adding Xmr event.
+    Request(Box<amounts::OutEvent>), /* Not-uniform with Bob on purpose, ready for adding Xmr
+                                      * event. */
     Message0 {
-        msg: bob::Message0,
+        msg: Box<bob::Message0>,
         channel: ResponseChannel<AliceToBob>,
     },
     Message1 {
@@ -87,14 +87,17 @@ impl From<peer_tracker::OutEvent> for OutEvent {
 
 impl From<amounts::OutEvent> for OutEvent {
     fn from(event: amounts::OutEvent) -> Self {
-        OutEvent::Request(event)
+        OutEvent::Request(Box::new(event))
     }
 }
 
 impl From<message0::OutEvent> for OutEvent {
     fn from(event: message0::OutEvent) -> Self {
         match event {
-            message0::OutEvent::Msg { channel, msg } => OutEvent::Message0 { msg, channel },
+            message0::OutEvent::Msg { channel, msg } => OutEvent::Message0 {
+                msg: Box::new(msg),
+                channel,
+            },
         }
     }
 }