feat(annotation) Add default annontation properties #694
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add line length property
This came up during a meeting that the scale bar has been used as a rough measure of the size of features in datasets. I was thinking we should have a better way to measure distance and the line annotation is already a tool that has most of the requirements.
I think it would also make sense to add additional properties for other types such as ellipsoid volume and semi axis lengths, bounding box volume and dimensions.
I am currently making assumptions to cast float32array to a vec3 and there might be a better method of using the globalCoordinateSpace.