point as bounding-polygon

[pvgenuchten]

this brings in some features from 3.10 to use a point as boundingpolygon, resolves #4811 for gn4
this manages the schema and ui part, aspects of #5396 may be required to get the full feature supported

[GeoSander]

I didn't test on GN4, but it looks good/complete to me.

[pvgenuchten]

point gets correctly added and displayed to editor, a fix is required on extent api (currently returns: No region with metadata:@id125 found).

[fxprunayre]

point gets correctly added and displayed to editor,

Should we change label "bounding polygon" by bounding geometry ?

it could also make sense to have same layout for tools in bbox and geometry ? Maybe Michel has time to have a look ? Button toolbar and color ? But could be in another PR.

[MichelGabriel]

bounding geometry

Yes, that's fits better

[MichelGabriel]

I did have a look, have some ideas, but will make a new PR for it

[pvgenuchten]

added label fix as suggested by @fxprunayre

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