Method subscribe

packages/context/src/context.ts:405–407

* Add a context event observer to the context * @param observer - Context observer instance or function

(observer: ContextEventObserver)

   * @param observer - Context observer instance or function
   */
  subscribe(observer: ContextEventObserver): Subscription {
    return this.subscriptionManager.subscribe(observer);
  }

  /**
   * Remove the context event observer from the context