Implement methods to store and retrieve current_user_id from database in CommCoreModule

Summary: This differential via CommCoreModule to JavaScript methods to retrieve and set current user ID that are defined and implemented in DatabaseQueryExecutor and SQLiteQueryExecutor in the parent diff.

Test Plan: Test plan is exactly the same as for parent diff with the difference that we want to call correspinding methods of global.CommCoreModule object instead of SQLiteQueryExecutor directly. This way we can be sure they work in JavaScript as well.

Reviewers: tomek, jon

Reviewed By: tomek

Subscribers: ashoat, adrian, atul, abosh

Differential Revision: https://phab.comm.dev/D4794