Docs: add meter label for chargers

[naltatis]

Is your feature request related to a problem? Please describe.
Would be nice if the chargers overview would also indicate if the evcc implementation supports built-in meter reading. I should become a filter like 1p3p or RFID.
https://docs.evcc.io/docs/devices/chargers

Some chargers come in different variants (with or without meter), but this is something the user has to take care of when buying. From our side, I think it's sufficient to indicate that we can read it if it exists.

Describe the solution you'd like
Manually go through all the templates and add a meter tag to the devices capabilities.

Additional context
Helpful for making buying decisions based on supported feature set.

[andig]

Finde ich gut. Damit haben wir dann alle relevanten Capabilities die wir auch bei Empfehlungen betrachten adressiert.

[premultiply]

Wakeup fehlt noch, aber das weiß man meist einfach nicht.

[andig]

Finde ich gut

Habs mir anders überlegt- v.a. weil es diverse Boxen in unterschiedlichen Varianten gibt. Close?

[naltatis]

Some chargers come in different variants (with or without meter), but this is something the user has to take care of when buying. From our side, I think it's sufficient to indicate that we can read it if it exists.

Ich glaub weiterhin dass das ne gute Idee ist. Aktuell muss der User in den Code gucken um rauszufinden ob wir das unterstützen. Die Info hilft bei der Kaufentscheidung.