Add new favicon

packages/person-select/src/person-select.js

toolkit-showcase/assets/apple-touch-icon.png

toolkit-showcase/assets/favicon.ico

toolkit-showcase/assets/favicon.svg

toolkit-showcase/assets/favicons/README.md

toolkit-showcase/assets/favicons/android-chrome-192x192.png

toolkit-showcase/assets/favicons/android-chrome-512x512.png

toolkit-showcase/assets/favicons/apple-touch-icon.png

toolkit-showcase/assets/favicons/browserconfig.xml

toolkit-showcase/assets/favicons/favicon-16x16.png

toolkit-showcase/assets/favicons/favicon-32x32.png

toolkit-showcase/assets/favicons/favicon.ico

toolkit-showcase/assets/favicons/favicon.svg

toolkit-showcase/assets/favicons/maskable-icon-512x512.png

toolkit-showcase/assets/favicons/maskable-icon.png

toolkit-showcase/assets/favicons/mstile-144x144.png

toolkit-showcase/assets/favicons/mstile-150x150.png

toolkit-showcase/assets/favicons/safari-pinned-tab.svg

toolkit-showcase/assets/favicons/site.webmanifest

toolkit-showcase/assets/icon-128x128.png