added connection of AppDelegate & sdk

[Techblogogy]

This might be a "controversial change", but I've encountered an issue on my end, maybe someone else encountered something similar.

In "Facebook Events Manager" for my project, I needed to "configure app Events for SKAdNetwork" on iOS side of things.

Before you can do it, you have to go through verification procedure, where they send you a notification to a facebook app on your phone, which then opens up you app.

When running this verification, it kept failing, right until a moment I've introduced changes suggested in this PR.

Maybe my solution was just a fluke, but it helped me, so I've decided to submit it for review, just in case somebody else encounters something similar.

[ibrahimdevs]

@DennisAlund thanks for great work. Could you check this pull request?
Facebook force this update to track app events without Add Tracking Permission.

[ndahlquist]

Confirmed that this fix worked for us too.

Before this patch:

• The "Verify your app's deep link" flow in Facebook Events Manager successfully opened the app, but did not complete the verification.

After this patch:

• We were able to complete the deep link verification flow successfully.

Thank you @Techblogogy!

[bhavik-multipl]

Will it take time to merge this PR?

[DennisAlund]

This seems good. I am making a note for the future whether it will be necessary to also implement the SceneDelegate as mentioned needed for iOS13