add MODIS joint histgram diagnostics

[caseywall7926]

We would like to add four new joint-histogram diagnostics to the MODIS simulator:

1. CTP-COT joint histogram for liquid-topped clouds
2. CTP-COT joint histogram for ice-topped clouds
3. CWP-CER joint histogram for liquid-topped clouds
4. CWP-CER joint histogram for ice-topped clouds

(CTP: cloud-top pressure; COT: cloud optical thickness; CWP: cloud water path; CER: cloud particle size)

These diagnostics correspond to the observational dataset from Pincus et al. 2023 (https://doi.org/10.5194/essd-15-2483-2023). Additionally, we would like to make several small changes to the histogram bin edges to match the data from Pincus et al.