…nil OR empty (#1114)

* Add start function, adjust test app for testing, lifecycle currently not working

* added scenedelegate support

* remove logs and add notification handler for uiapplication foreground

* Automatically find scenedelegate

* add check for tvOS

* Add a sample extension to make sure that it is still registered even without any calls to it

* add core options and make api app only

* clean up for presentation

* Rework initialization api signature.

* Use affirmative boolean InitOptions.enableLifecycleTracking instead.

* Add Objectiv-C annotation for initalize and InitOptions

* Add default value to initialize 'options' api

* Add convenience initializer in InitOptions for Objc

* Refactor InitOptions to just include disableAutomaticLifecycleTracking and additionalContextData parameters.

* Fix check to disable auto lifecycle tracking.

* Add flag to initialize to prevent multiple calls

* Add 'appGroup' to InitOptions

* Change InitOptions to use parameterless initializer.

* Change InitOptions to use affirmative boolean 'automaticLifecycleTracking'

* Add 'appId' to InitOptions and provide convenience 'initialize' api

* Add initializers to InitOptions to set appId or filePath

* Rename InitOptions properties 'lifecycleAutomaticTracking'

* Remove assert from ClassFinder

* InitOptions import Foundation to support objc attribute.

* Fix unused value warning in ClassFinder

* Remove SampleExtension from Core.

* Updates to log messages in MobileCore.initialize

* Refactor initialization code to MobileCoreInitializer class

* add test to ClassFinderTests

* Add MobileCoreInitializer unit tests

* Rename InitOptions.lifecycleAutomaticTracking to lifecycleAutomaticTrackingEnabled

* Format and autocorrect files

* Remove unused import and variable in MobileCore

* Add back testBackground in Swift test app

* Call config APIs before registerExtensions

* Move logic to check for SceneDelegate inside setupLifecycle func

* Call initial lifecycleStart from main thread when not in background

* Update API files

* Move ClassFinder to AEPCore module and make internal

* Setup Lifecycle before calling registerExtensions

* Update AEPServices API after moving ClassFinder to AEPCore

* Specify ClassFinder test using measure is available tvOS 13+

* Use custom Protocol when testing ClassFinder

* Remove unused pendingExtensions array

* Update a few comments in MobileCoreInitializer

* Remove MobileCoreInitializer.shared and add instance to MobileCore.

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Co-authored-by: Christopher Hoffmann <cdhoffmann@users.noreply.github.com>

#1112)

* Add documentation for initialize API

* Few updates. Add note stating API added since 5.4.0

Updating versions to 5.4.0