SDK-4249: [Draft] [Do Not Merge] Swift support Configuration testing

[akashvercetti]

NOTE: This is a testing branch to test various integration scenarios and github worflows. We will make a separate branch with the final Package.swift, Podspec and Workflows.

What	Where/Who
JIRA Issue	SDK-4249 and SDK-4101
People Involved	@akashvercetti , @nzagorchev

Background

We need to support Swift to implement some upcoming features for the SDK. A lot of newer Apple APIs do not support Objective-C. This is a testing branch for the purpose of testing various permutations of client integrations and swift-objc interopability.

Implementation

1. Added podspec changes to support swift, namely the swift version. Private headers can be added later if a swift class needs to import a private Objective-C header/file like so: s.private_header_files = 'PrivateHeader.h'.
2. Added Package.swift changes to support swift. We will have to distribute via a binary target and XCFramework to support mixed languages. Currently its a local path for the XCFramework but we will distribute it via github releases.
3. Modulemap comments to import private headers in swift for the future.
4. Added dynamic XCFramework for distributing via SPM. TODO: Remove local xcframework and distribute via github releases.

Testing

We will need to test the following.

• Objective-C apps via manual integration.
• Swift apps via manual integration.
• Objective-C apps via Cocoapods integration.
• Swift apps via Cocoapods integration.
• SPM apps.
• SwiftUI apps.
• Compatibility with CTNotificationService and CTNotificationContent.
• Hybrids (RN/Flutter/Cordova).
• Leanplum Wrapper SDK.
• Leanplum Unity.

TODO:

• Remove swift files and import statements added for testing purposes
• TODO comments in code
• SPM xcframework distribution via github releases or via a script

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