[web] Introduce NotificationsOption component

Summary:
Introduce a component describing one notification setting with radio button.

Test Plan: It's not used yet. Tested when introducing modal with multiple options in one of next diffs.

Reviewers: palys-swm, atul, benschac

Reviewed By: palys-swm, atul

Subscribers: ashoat, Adrian, atul, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3949