Add individual chargers to the charging stations theme

[thibaultmol]

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https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dcharge_point I like mapping the ref id's of each individual charger at an amenity=charging_station but that's currently not possible because it's best to put those on the individual chargers.

Wihile I don't think it's a super hard requirement, it's best that the charging station itself is an area and not a node, which is currently not actually possible to do in Mapcomplete (maybe something for a future nlnet grant @pietervdvn ;-) ) But yeah, maybe it's fine to add individual chargers anyway