Fix lazy loading of ObjectStoragePath fs backends

[bolkedebruin]

The new structure introduces eager loading, which we don't want. This re-instates lazy loading at the expense of that storage_options might not be fully parsed.

@potiuk @ap-- @Taragolis

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[bolkedebruin]

@ap-- could you take a look if this makes sense? particularly the __str__ function as its a bit of a hack to workaround https://github.com/fsspec/universal_pathlib/issues/198

[ap--]

This fails du to an import when the path needs to be parsed. I will open a new issue in universal_pathlib to see how long this could be delayed.

[dirrao]

I see a few tests are failing. Closing and reopening to return them.

[bolkedebruin]

closing as this will be solved differently