These will be wrappers around leafygreen-ui components that we can later add a (dark) theme provider to.

The components we'll need which make up compass-connect and are in leafygreen-ui are:

banner
button
icon
icon-button
modal
radio-box-group
select
toggle
text-input
text-area

For this ticket we can just do the ones which are used already in Compass. We can add the ones which are not yet used in Compass as they come up.