Add rust lint CI job. (#9)

Additionally fix the many lint errors that are occurring. (or disable them).

Reviewed-on: #9
Co-authored-by: Drew Galbraith <drew@tiramisu.one>
Co-committed-by: Drew Galbraith <drew@tiramisu.one>

rust/lib/voyageurs/src/listener.rs

@@ -7,7 +7,7 @@ use mammoth::thread;
 #[allow(dead_code)]
 #[derive(PartialEq, Eq, PartialOrd, Ord, Copy, Clone)]
 enum Keycode {
-    UnknownKeycode = 0x0,
+    Unknown = 0x0,
 
     A = 0x1,
     B = 0x2,
@@ -135,7 +135,7 @@ impl Keycode {
             0x37 => Keycode::Period,
             0x38 => Keycode::FSlash,
             0x39 => Keycode::Esc,
-            _ => Keycode::UnknownKeycode,
+            _ => Keycode::Unknown,
         }
     }
 }