Added linestring geom to curb zone

[InrixParking]

Explain pull request

Curb Zones geometry should be able to be represented as linestrings as well (currently it is restricted to polygon) -- often we know the length of a curb zone but not the "width". Allow type linestring for geometry field under curb zone

Is this a breaking change

• No, not breaking

Impacted Spec

• Curbs

Additional context

Discussed here #119

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