[native] deduped open thread and create thread option

Summary:
deduped open_thread and create_thread to just be thread. This is because both create_thread and open_thread have the same function. This diff was inspired by this comment on D5381

Depends on D5381
Linear Task: ENG-2037

Test Plan:
Please watch the video demo to see that there are no visaul or performance regressions:

Reviewers: atul, rohan

Reviewed By: atul

Subscribers: ashoat, tomek, atul, abosh

Differential Revision: https://phab.comm.dev/D5451