Presenting CountryCodePickerViewController causes 50% frozen frame rates

[hyouuu]

New Issue Checklist

• [v] Updated PhoneNumberKit to the latest version
• [v] Phone number formatted correctly on JavaScript version
• [v] I searched for existing GitHub issues
• [v] I am aware that this library is not responsible of adding/removing/changing phone number formats and any request should be done at libphonenumber repo

Steps to reproduce

Presenting CountryCodePickerViewController

Expected result

UI loads smoothly without freeze

Actual result

Firebase performance catches that the CountryCodePickerViewController causes frozen frames almost all the time.
Looked at the code and it's probably initializing the country code on the main thread - should have a loading state and load countries in background, and ideally lazily

Environment

SPM 4.0.1 on iOS in various versions