[web][native] olm api method to mark prekeys as published

Summary: we need to mark prekeys as published after we publish them to the identity service

Test Plan: called the native and web methods and confirmed that there were no unpublished prekeys after calling them

Reviewers: marcin, kamil

Reviewed By: marcin, kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12479