[native] introduce new vector assets for new thread notification settings experience

Summary:
We need three new assets for the new thread notification settings. This diff introduces them.

Copied the svg code from the web assets and used the this tool (recommended by SWM) to convert the svg code to react-native-svg:

https://react-svgr.com/playground/

Test Plan:
Confirmed that the new vector assets looked good

Reviewers: ashoat, inka

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12644