Pangeo-forge-recipes

- Apache Beam executor added. https://github.com/pangeo-forge/pangeo-forge-recipes/issues/169. By [Alex Merose](https://github.com/alxmrs). ❤️
- Dask executor updates. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/260, https://github.com/pangeo-forge/pangeo-forge-recipes/pull/261
- Index type update. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/257
- Fix incompatibility with `fsspec>=2021.11.1`. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/247

- Major internal refactor of executors. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/219.
- Began deprecation cycle for recipe methods (e.g. `recipe.prepare_target()`) in favor of module functions.
- Addition of `open_input_with_fsspec_reference` option on `pangeo_forge_recipes.recipes.XarrayZarrRecipe`, permitting the bypassing of h5py when opening inputs. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/218.

- Added `pangeo_forge_recipes.recipes.HDFReferenceRecipe` class to create virtual Zarrs from collections of
NetCDF / HDF5 files. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/174
- Limit output from logging. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/175
- Change documentation structure. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/178
- Move `fsspec_open_kwargs` and `is_opendap` parameters out of `pangeo_forge_recipes.recipes.XarrayZarrRecipe` and into `pangeo_forge_recipes.patterns.FilePattern`. Add `query_string_secrets` as attribute of `pangeo_forge_recipes.patterns.FilePattern`. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/167

- Added `subset_inputs` option to {class}`pangeo_forge_recipes.recipes.XarrayZarrRecipe`. https://github.com/pangeo-forge/pangeo-forge-recipes/issues/93, https://github.com/pangeo-forge/pangeo-forge-recipes/pull/166
- Fixed file opening to eliminate HDF errors related to closed files. https://github.com/pangeo-forge/pangeo-forge-recipes/issues/170, https://github.com/pangeo-forge/pangeo-forge-recipes/pull/171
- Changed default behavior of executors so that the `cache_input` loop is always run, regardless of the value of `cache_inputs`. https://github.com/pangeo-forge/pangeo-forge-recipes/pull/168

- Fixed issue with recipe serialilzation causing high memory usage of Dask schedulers and workers when executing recipes with Prefect or Dask https://github.com/pangeo-forge/pangeo-forge-recipes/pull/160.
- Added new methods `.to_dask()`, `to_prefect()`, and `.to_function()` for converting a recipe to one of the Dask, Prefect, or Python execution plans. The previous method, `recpie.to_pipelines()` is now deprecated.

* Added `copy_pruned` method to `pangeo_forge_recipes.recipes.XarrayZarrRecipe` to facilitate testing.
* Internal refactor of storage module.