* chore: 🤖 add @formatjs/intl-durationformat to addons/core * refactor: 💡 replace old duration format with new package * chore: 🤖 remove intl-unofficial-duration-unit-format * Add missing copyright headers * test: 💍 add more test cases --------- Co-authored-by: cameronperera <cameronperera@users.noreply.github.com>