Move from fs (pyfilesystem) to fsspec

[michaelweinold]

As suggested by @cmutel, moving to fsspec would solve two issues with fs (pyfilesystem):

1. The package is currently not under active development
2. Code of the sort if not _WINDOWS_PLATFORM: import grp causes an error in WASM (Pyodide/JupyterLite-XEUS):

• bw_processing.datapackage.fs.close() uses grp (which is not available in Pyodide) brightway-live#38
• bw2data error with config.is_test brightway-live#39

Note that this was patched in the current https://live.brightway.dev release:

import micropip
await micropip.install(
    'https://files.brightway.dev/fs-2.5.1-py2.py3-none-any.whl'
)

Still, it would be great to move to fsspec, which is supported by both Pyodide and emscipten-forge (via the pure Python channel).

This would close:

• fs imports grp in bw_processing, which is not supported in WASM brightway-live#53

[cmutel]

@michaelweinold Told you this was a dirty hack 😛

[cmutel]

Fixed in #66

[michaelweinold]

Noice! 🎉 Will remove the custom patch with the next bw_procesing release!