[native] Throw JSError in sync functions

Summary:
ENG-1471, code is based on this diff
Changes processMessageStoreOperationsSync and processThreadStoreOperationsSync to throw JSErrors instead of returning a boolean. Corresponding javascript code was changed from checking return value to a try/catch.

Test Plan:
Test on both Android and iOS.

1. Place temporary throw std::system_error(ECANCELED, std::generic_category(), "error"); outside the for loop in processMessageStoreOperationsSync and build the app.
2. Try and call the method with an empty array somewhere from javascript.
3. The app shouldn't crash and should display that there was a JSError.

Reviewers: atul, marcin, jon, tomek

Reviewed By: marcin, tomek

Subscribers: marcin, ashoat, abosh

Differential Revision: https://phab.comm.dev/D5201