[native] Terms of Use & Privacy modal

Summary:
Modal showing Terms of Use and Privacy Policy acknowledgment

Design:

Design (light mode)

Error flow:

Test Plan:

1. Check if links open properly
2. Check if the accept button works properly
3. Check if there is no possibility to close the modal in a different way than clicking I accept

Reviewers: tomek, atul

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D5831