[Newform AppsFlyer Integration] Add AppsFlyer SDK, adapter and ATT

[danielebogo]

📘 Part of: #2850

Fixes #2873
Fixes #2874

This PR implements:
• Adds the new SDK as dynamic SPM
• Create the new adapter
• Creates a new AnonymousIdentifiable protocol to implement the anon UUID

To test

• CI must be 🟢
• Make sure you set true these 2 FF: podcastNewformAppsFlyer and appsFlyerLogging
• Make sure you are logged in

Give Consent

• Run the app
• Confirm you see the ATT prompted
• Give consent
• Navigate a bit in the app
• You should see the AppsFlyer SDK debug log

Don't Give Consent

• Navigate to your System Settings -> Privacy -> Tracking and disable the consent
• Re-run the app (this settings change will kill the debugger)
• Confirm you don't see any SDK logs

Fresh Install

• Delete the app
• Re-run
• Confirm you see again the ATT prompt
• Give consent
• Confirm you see the logs

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[SergioEstevao]

Check all steps, logs show when consent is given and do not show when disabled.

[SergioEstevao]