Add image set z-slice number as metadata in the profiles

[jenna-tomkinson]

This issue came up in a discussion with @MikeLippincott about quality control at the "mask" or "cell" level. Because volume is greatly influenced by the number of z-slices for an image set, it is difficult to set accurate thresholding to detect if an organoid is taking up a whole image (large in the xy dimension) or is taking up a large number of slices (large in the z dimension).

By including z-slice number as a metadata, we could improve quality control by setting thresholds for only organoids with a set number of slices (e.g., outlier organoids for volume just for z-slices >15).

This metadata could also be helpful in other ways, but the main discussion point and plan is to implement in the context of quality control of the profiles (masks/cells).

[jenna-tomkinson]

Also, it might be helpful to include what range of slices that the organoid is seen in (e.g., organoid 1 in image-set 1 has 15 z-slices and the detected organoid 1 is segmented in slices 1-10).