E3SM-Project/e3sm_diags: ARM Diags

This is a major release.

• Incorporation of ARM-diags which uses in-situ measurements from DOE's ARM (Atmospheric Radiation Measurement) to compare with point grid model output. Diagnostics added include: seasonal mean, annual cycle cycle of a set of atmospheric variables, including (surface temperature, precipitation, radiation fluxes, surface turbulent fluxes...); diurnal cycle of precipitation and cloud; convection onset metrics.

• MERRA 2 datasets are updated to include monthly main daily maximum and minimum surface air temperature.

• Add a test suite for E3SM-Diags on Chrysalis/Anvil
• Image comparison tests added in unit tests and a complete run
• Integrate GitHub Actions CI/CD workflow
• Add and apply formatters and linters to codebase

• Code repo clean up by moving test data to E3SM data server and providing data download script.
• Simplify Conda environments

• Include quick guide for Chrysalis/Anvil
• Update post-processing and run scripts examples
• Update development guide