[native] Join a thread after accepting the invitation

Summary:
After clicking join button, a user joins a community. The part of this code with calendar filters was inspired by other places where user can join a thread.
Error handling and loading state will be added in next diffs.

Depends on D7556

Test Plan: Open a link to a new community. Accept the invitation - a new thread should appear on thread list and in community drawer. Also, the modal should get closed.

Reviewers: bartek, kamil, inka

Reviewed By: bartek

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D7557