feat: Added input system

- Added input plugin to manage controls config
- Added tests for casting InputMap to InputAsset and backwards

src/lib.rs

@@ -1,10 +1,20 @@
 pub mod player;
 pub mod layout;
+pub mod input;
+#[cfg(test)]
+mod tests;
 
 use bevy::prelude::*;
 
 pub struct ExpeditionPlugin;
 
+pub enum InputActions {
+    MoveLeft,
+    MoveRight,
+    ToggleInventory,
+    Interact,
+}
+
 fn camera_bundle() -> impl Bundle {
     (
         Camera2d,