Usage count on Lovelace cards

[WallyDW]

At times I decide to reinvent my dashboard setup and during that time I will install quite a few Lovelace cards, only to realize that a lot of them do not provide exactly functionality I need.
When I am done, then my frontend store will be filled with unused addons, but in order to figure out which ones I can remove I have to first look up the custom: tag and then search for that in the raw configuration editor .
It can at times be quite hard to find those last addons with no usage, so what I propose is a feature that will look up an addon's custom: tag and then scan and tally up the usage and show that on the addon card overview.

I guess many will discover that they have unsued addons and it can also be extended with features that can show line numbers with usage in the raw configuration editor or actually show a temporary dashboard with the cards with usage.

The feature will also be usefull when there are breaking changes.