feat: Add virtual detection area

[jruebsam]

#### Reference to a related issue in the repository 733

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• [ ] My suggestion follows the style and contributors guidelines.
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[thempen]

Other Models & Harmonization Group:

• The Polygon3D should not be restricted to 2 dimensions. The restriction should be made in the VirtualDetectionArea documentation.
• The position to the virtual sensor coordinate system should be clarified.

[pmai]

CCB 2024-03-25: Merge with suggested changes.

[jdsika]

@pmai We have the base_polygon. We should have defined this at the time?

//
// \brief Polygon in 2 dimensions
//
// A polygon in 2 dimensions which contains a list of vertices.
//
message Polygon2d
{
    // A list of vertices
    //
    repeated Vector2d vertex = 1;
}

Reviewed for v3.7.0