Add typings to export field

[MaxTechnics]

This is related to https://github.com/vueuse/motion/issues/118

Turns out that the typings field is no longer being used when an exports field is defined.

source: https://stackoverflow.com/questions/76211877/the-xxxx-library-may-need-to-update-its-package-json-or-typings-ts

[Tahul]

Thank you so much!