onAction (id, cb) {
    let list = this.actions.get(id)
    if (!list) {
      list = []
      this.actions.set(id, list)
    }
    list.push(cb)
  }
Listener triggered when a Plugin action is called from a client addon component.

@param {string} id Id of the action to listen
@param {any} cb Callback (ex: (params) => {} )