feat: add useEventListener composable

src/ui/composables/event.js

@@ -0,0 +1,18 @@
+import { onBeforeMount, onBeforeUnmount } from 'vue';
+
+/**
+ * @param {*} api the specific openmct API to use i.e. openmct.editor
+ * @param {string} eventName
+ * @param {() => void} handler
+ */
+export function useEventListener(api, eventName, handler) {
+  onBeforeMount(() => {
+    // Add the event listener before the component is mounted
+    api.on(eventName, handler);
+  });
+
+  onBeforeUnmount(() => {
+    // Remove the event listener before the component is unmounted
+    api.off(eventName, handler);
+  });
+}