Add ids() function to VMStore and destroy() method to VirtualMachine

wasm/lib/src/vm_class.rs

@@ -40,6 +40,12 @@ impl VMStore {
             cell.borrow_mut().remove(&id);
         });
     }
+
+    pub fn ids() -> Vec<JsValue> {
+        STORED_VMS.with(|cell| {
+            cell.borrow().keys().map(|k| k.into()).collect()
+        })
+    }
 }
 
 #[wasm_bindgen(js_name = VirtualMachine)]
@@ -64,5 +70,9 @@ impl WASMVirtualMachine {
         }
     }
 
+    fn destroy(self) {
+        VMStore::destroy(self.id)
+    }
+
     // TODO: Add actually useful methods
 }