Fix: Validate PrivacyInfo.xcprivacy and warn users of required missing privacy parameters.

[lucas-zimerman]

As a requirement by Apple

This PR Adds a PrivacyInfo manifest containing all the required parameters by the SDK if the user didn't provide a PrivacyInfo manifest, otherwise, it will warn the user if their PrivacyInfo manifest is missing any required parameter by the SDK.

Other changes:

• By default, the buildTransitive task is automatically loaded from a nuget package, that's why I added to the directory .prop files from the samples to load this task, so it behaves similarly how the SDK would behave when loaded from a nuget package.

Close #148