* Restores ML Pods after M77.
* Fix Package.swift
* Re-add catalyst to GHA workflow.
* Includes the implementation of: 1) download types, 2) list models, 3) delete model.
* Add protocol to handle writing to user defaults.
* Add protocol to handle writing to user defaults.
* Add empty init to ModelDownloadConditions.
* Copyright year + other minor fixes.
* TODO to use FirebaseApp internal init for test app.
* Test if download progress is in range.
* Remove not nil test for progress.
* Remove not nil test for progress.
