CXP-185: Event callbacks

[NicHaley]

Description

Adds eventCallbacks support to the iOS SDK. This allows a callback to be triggered by the App following a message in the bot.

To test, setup a JavaScript Event block in your bot. Set the bot handle in ExampleApp to your bot. Add the eventCallbacks attribute to your bot. Note: The JavaScript Event requires the custom_javascript_event_block feature flag be turned on.

ex.

lazy var adaFramework = AdaWebHost(handle: "nic", appScheme: "adaexampleapp", eventCallbacks: ["my-event": { event in print("it worked!") }])

Start the simulator and test. It should work! You can also try specifying a general callback with "*" as the key name. This will be triggered for any event.

---

Checklist

• [ ] The steps for distribution have been follow here.
• [ ] A Release Note has been drafted and published after merging to master.

[px0]

Oof you always tag me in those like I know what I'm doing 😅