[NativeRustModule] implement uploading prekeys

Summary: [ENG-6385]https://linear.app/comm/issue/ENG-6385/implement-native-method-to-refresh-prekeys)

Test Plan: Call this method and test if it works by inspecting staging DDB table

Reviewers: marcin, michal, varun

Reviewed By: varun

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10618