[lib] moved ModalOverlay component from web to lib
Summary:
moved modal-overlay.react and modal-overlay.css from web to lib.
Depends on D5364
Linear Task: ENG-2038
Test Plan:
Please watch the video to see that there are no visual or performance regressions with the migration of ModalOverlay from web to lib
Reviewers: atul, rohan, abosh, przemek
Reviewed By: atul, przemek
Subscribers: ashoat, tomek, atul, abosh
Differential Revision: https://phab.comm.dev/D5370