Provide "display only" menu items with no actions

[philipabbey]

Ref: https://community.home-assistant.io/t/home-assistant-app-for-garmin/637348/331?u=np_complete

Now that the template type is deprecated, which should be the right syntax for an entry showing info, without any expected action (such as showing room temperature and humidity)? A “tap” entry with an empty tap_action section? Even though that shows a warning?

There does not seem to be a neat way to have "display only" menu items since the generalisation of template contents in all menu items and the deprecation of the template item.

I can make this work with a "toggle" menu item, but then there's an unwanted icon. This suggests the need for a new class for "display only" items with no actions or service calls.