Add neo objects as data sources#14

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JuliaSprenger wants to merge 9 commits intobrainets:masterfrom

JuliaSprenger:enh/neo

Commits on Nov 5, 2021

Add neo objects as ephy data sources
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Adding neo to requirements and docs
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move neo handling from ds_ephy to suj_ephy
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starting to add neo support to conn
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adding 'as_neo' support for single subject simulation
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listing neo as possible input type
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add physical units to xarray attributes
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make neo a soft dependency
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fix typo and minor bug
sprenger
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