[openstreetmap/openstreetmap-website] Add rendering for natural=tree_group (Issue #3517)

[FinixFighter]

### Description

The tag natural=tree_group is not much used right now, but I think it is very useful and could be become very used if it is added to the wiki (https://wiki.openstreetmap.org/wiki/Key:natural), so that mappers can find it more easily. 
I often happen to map areas within a city where there are a lot of trees, but these areas are not parks, nor managed forests, and natural=tree_group is the best tag I could find.
A couple of examples are 1)https://www.openstreetmap.org/way/904760959 (more than one group of trees), and 2)https://www.openstreetmap.org/way/1043580038.
A possible rendering could be a light green (same as grass) with trees symbols on it (as on natural=wood).

### Screenshots

_No response_

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