feat(api): notify api of mic and camera errors (#4289)

- Use actions to notify the rest of the app that
  a mic or camera error has occurred
- Use middleware to respond to those notifications
  of errors by showing in-app notifications and
  notifying the external api

modules/API/API.js

@@ -559,6 +559,38 @@ class API {
         });
     }
 
+    /**
+     * Notify external application of an unexpected camera-related error having
+     * occurred.
+     *
+     * @param {string} type - The type of the camera error.
+     * @param {string} message - Additional information about the error.
+     * @returns {void}
+     */
+    notifyOnCameraError(type: string, message: string) {
+        this._sendEvent({
+            name: 'camera-error',
+            type,
+            message
+        });
+    }
+
+    /**
+     * Notify external application of an unexpected mic-related error having
+     * occurred.
+     *
+     * @param {string} type - The type of the mic error.
+     * @param {string} message - Additional information about the error.
+     * @returns {void}
+     */
+    notifyOnMicError(type: string, message: string) {
+        this._sendEvent({
+            name: 'mic-error',
+            type,
+            message
+        });
+    }
+
     /**
      * Notify external application (if API is enabled) that conference feedback
      * has been submitted. Intended to be used in conjunction with the