chore: Add privacy manifest to Auth0.Swift

[poovamraj]

Privacy Manifest is required by Apple from May 1st. We have added this to our SDK in this PR

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

📋 Changes

• Added PrivacyManifest file
• PrivacyManifest includes NSPrivacyCollectedDataTypeUserID with purpose as NSPrivacyCollectedDataTypePurposeAppFunctionality
• Added it to .podspec and Package.swift

📎 References

https://developer.apple.com/app-store/app-privacy-details/#user-tracking
https://developer.apple.com/documentation/bundleresources/privacy_manifest_files/describing_data_use_in_privacy_manifests#4144131

🎯 Testing

Repos with test integration
https://github.com/poovamraj/spm
https://github.com/poovamraj/carthage

[Widcket]

This is missing the changes needed to support apps that use Carthage to install Auth0.swift.
Did you test the changes in a sample app that uses Carthage?

[wongk]

This change is causing an error when building our application.

error: Multiple commands produce '/Users/expo/Library/Developer/Xcode/DerivedData/HealthCoach-cadkgkgehnezpjdtijikapiciihy/Build/Intermediates.noindex/ArchiveIntermediates/HealthCoach/InstallationBuildProductsLocation/Applications/HealthCoach.app/PrivacyInfo.xcprivacy'

Please see: https://stackoverflow.com/a/78344724. The podspec should use the following format:

"resource_bundles": {"LibName": "LibName/PrivacyInfo.xcprivacy"}