[image-picker] install expo-image-picker lib

Summary: This diff installs the expo-image-picker library.

Test Plan: There are no callsites to this library yet, so we just want to make sure the build succeeds for iOS and Android and the app runs successfully.

Reviewers: atul, bartek, ashoat

Reviewed By: atul, ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D6145