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/input/AvatarInputField.tsx

@@ -122,3 +122,5 @@ export const AvatarInputField = forwardRef<HTMLInputElement, Props>(
     );
   },
 );
+
+AvatarInputField.displayName = "AvatarInputField";

src/input/Input.tsx

@@ -166,6 +166,8 @@ export const InputField = forwardRef<
   },
 );
 
+InputField.displayName = "InputField";
+
 interface ErrorMessageProps {
   error: Error;
 }