Ensure that all our components have display names

This turns on a lint rule to require display names for all of our components, which makes it a lot easier to find your way around the component tree in React's dev tools.

src/button/Button.tsx

@@ -80,6 +80,7 @@ interface Props {
   // TODO: add all props for <Button>
   [index: string]: unknown;
 }
+
 export const Button = forwardRef<HTMLButtonElement, Props>(
   (
     {
@@ -135,6 +136,8 @@ export const Button = forwardRef<HTMLButtonElement, Props>(
   },
 );
 
+Button.displayName = "Button";
+
 export const MicButton: FC<{
   muted: boolean;
   // TODO: add all props for <Button>