Build_lut updates for Isofit 3

[evan-greenbrg]

Here are the updates for the build_lut scripts with all of the hooks working with Isofit 3. It may need another pair of eyes to validate that the configs generated have all of the necessary components.

This also includes a new flag in the cli to make the grid via a sobel sequence. I tried the match the Julia code from the Sobel branch. The regular and Sobel grids used are still hard coded into the python script. The regular grid is the same as what is on the original branch. The Sobel grid is smaller (from my testing)

In the Sobel grid generation, I've made it possible to generate different lengths of lut elements. This should be pretty self-explanatory in the code.

So far I haven't done too much rigorous testing.

• I have only run locally to confirm that the correct number of files are generated. I was having some issues this weekend where only one worker was saving the files. I just re-ran today and couldn't replicate this issue.
• It needs to be run on the cluster to confirm.
• I also haven't run the generated config files through modtran/6s to confirm that they work properly.

This will also need a PR on Isofit to go through to run properly. I'll attempt to link the two.