debugger: Enable setting debug panel dock position to the side (#29914)

### Preview
<img width="301" alt="Screenshot 2025-05-05 at 11 08 43 PM"
src="https://github.com/user-attachments/assets/aa445117-1c1c-4d90-a3bb-049f8417eca4"
/>


Setups the ground work to write debug panel persistence tests and allows
users to change the dock position of the debug panel.


Release Notes:

- N/A

crates/workspace/src/pane_group.rs

@@ -176,6 +176,10 @@ impl PaneGroup {
         };
         self.pane_at_pixel_position(target)
     }
+
+    pub fn invert_axies(&mut self) {
+        self.root.invert_pane_axies();
+    }
 }
 
 #[derive(Debug, Clone)]
@@ -441,6 +445,18 @@ impl Member {
             Member::Pane(pane) => panes.push(pane),
         }
     }
+
+    fn invert_pane_axies(&mut self) {
+        match self {
+            Self::Axis(axis) => {
+                axis.axis = axis.axis.invert();
+                for member in axis.members.iter_mut() {
+                    member.invert_pane_axies();
+                }
+            }
+            Self::Pane(_) => {}
+        }
+    }
 }
 
 #[derive(Debug, Clone)]