[web] Move EnumSettingsOption[Info] components to /components

Summary:
Can move these to components since they're now "generic" and can be used elsewhere (eg for the ThreadSettingsPrivacyTab)

Depends on D4048

Test Plan:

1. Open NotificationsModal
2. Make sure everything still looks/works as expected

Reviewers: def-au1t, palys-swm, benschac

Reviewed By: palys-swm

Subscribers: ashoat, Adrian, yayabosh

Differential Revision: https://phabricator.ashoat.com/D4049