[MC-1886] Do not handle push on launch if Leanplum library

[nzagorchev]

JIRA	MC-1886

Overview

CleverTap push notification open action is handled twice when using Leanplum SDK. The notification is handled by the application:didFinishLaunchingWithOptions: in CleverTap and also handled from UNUserNotificationCenterDelegate didReceive method.
If the notification is not handled by Leanplum, there are cases where it is not handled at all. This happens when the application already became active and CleverTap does not handle the deeplink since app is in foreground. The method _appEnteredForegroundWithLaunchingOptions calls _handlePushNotification with the launch options which passes openDeepLinksInForeground:NO.

Implementation

Check if the library is Leanplum. Do not handle the notification in this case, and log a message.

Testing

Manual QA

[nishant-clevertap]

Changes LGTM.

We can put found push notification at launch logs in else block if we don't want two consecutive logs printed for if condition.
Also verify the hybrid wrapper SDKs once if this is working fine.

[nzagorchev]

@nishant-clevertap
I have tested on Leanplum React-Native and Unity. On both, the onDidFinishLaunchingNotification is called before the CleverTap instance is created so CleverTap will not handle the notification. The notification is only handled once even without the fix in this PR.
Leanplum overrides the library on react-native (it is set to "React-Native" from the CleverTap ReactNative SDK). On Unity, the CleverTap Unity SDK sets it to "Unity" but when the notification is handled, it is "Leanplum".