Update loading state of the switch component

[andyjih]

1. Update the switch component to support the loading state
   a. Rename component from Toggle to Switch
   b. Migrate from styled components to sass
2. Identify areas where the loading state is supported
   a. Search in code for the Toggle component and figure out which ones need to have the loading state
3. Update layout around toggle to include error messages when the request fails

Designs here: https://www.figma.com/proto/etaOkOsnXMoKwbfhCD71kw/WEB-APP?page-id=34030%3A187870&node-id=34051%3A188679&viewport=305%2C48%2C0.25&scaling=min-zoom&starting-point-node-id=34051%3A188679&show-proto-sidebar=1

[octavia-squidington-iii]

cc @airbytehq/frontend

[krishnaglick]

The error functionality, based on the mocks, needs to exist outside the Switch component.
Adding in loading states is fine, and while I can include error messages if they're generated I feel it's slightly outside the apparent scope.
Error reporting should perhaps be part of a larger body of work as often our Error Boundaries just eat them since they're bubbled up through the render tree.