:monocle_face: Subset WeatherBench2 to one year and select variables

[weiji14]

Obtaining a temporal subset of WeatherBench2 for the year 2000 only, at pressure level 500hPa, with data variables: geopotential, u_component_of_wind, v_component_of_wind. Disabling compression when saving to Zarr so that it can be read back using cupy-xarray's kvikIO engine developed at https://github.com/xarray-contrib/cupy-xarray/pull/10 (as of Oct 2023).

References:

• https://weatherbench2.readthedocs.io/en/latest/data-guide.html
• Rasp, S., Hoyer, S., Merose, A., Langmore, I., Battaglia, P., Russel, T., Sanchez-Gonzalez, A., Yang, V., Carver, R., Agrawal, S., Chantry, M., Bouallegue, Z. B., Dueben, P., Bromberg, C., Sisk, J., Barrington, L., Bell, A., & Sha, F. (2023). WeatherBench 2: A benchmark for the next generation of data-driven global weather models (arXiv:2308.15560). arXiv. http://arxiv.org/abs/2308.15560