Default FSSpec caching arguments

FSSpec's default caching behavior is designed for tabular data and performs poorly for datacubes. Recommendations for better better arguments can be found in the Xarray's tutorial.

For example, see the figure below from the Open Source Geospatial Workflows in the Cloud workshop showing how much slower it is to open a datacube via xarray.open_mfdataset() when using the default readahead fsspec caching mechanism vs. a block cache. For a bonus, you can provide even faster access by virtualizing your data using VirtualiZarr and Icechunk!