This PR adds new `Button` and `IconButton` components built on top of
our new button abstractions.
Both of these buttons are built from the common `ButtonLike` base, and
implement the `ButtonCommon` (name TBD) trait in order to provide a
common interface.
There are still some visual tweaks that we'll need to make to the new
buttons, but those should be straightforward to make after we land this.
Release Notes:
- N/A
This PR makes the `toggle` method on the various list components accept
an `impl Into<Option<bool>>` instead of just an `Option<bool>`.
This allows a caller with just a `bool` avoid having to wrap the
`Option` themselves.
Release Notes:
- N/A
