Taking layer scale into account for regionprops

[K-Meech]

Currently, the scale of Napari layers doesn't seem to be taken into account during the regionprops calculations. This means that e.g. areas aren't scaled by the given pixel size, and are just given in pixel units.

regionprops_table has a 'spacing' parameter which the layer .scale could be passed into: https://scikit-image.org/docs/stable/api/skimage.measure.html#skimage.measure.regionprops_table , which currently isn't used:

napari-skimage-regionprops/napari_skimage_regionprops/_regionprops.py

Line 116 in e38cc72

table = sk_regionprops_table(np.asarray(labels).astype(int), intensity_image=np.asarray(image),

Would it be possible to add this? Thanks!