Add noise artifact

[ReneSkukies]

I wrote a short script in a dev subfolder that should be able to easily add an artifact to the package. For now the artifact is lazily loaded, i.e. the artifact is not installed/ downloaded unless it is called upon.
We would only need to change the url in the script, once we have uploaded a noise dataset as .tar file.

Real noise can then be used by calling on the artifact by using artifact"RealNoise" to get the artifact path and then loading it.

[codecov-commenter]

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[behinger]

hey great! Have a look at https://github.com/unfoldtoolbox/UnfoldSim.jl/blob/multichannel/test/artifactheadmodel.jl to see how I uploaded the headmodel artifact for UnfoldSim (not yet merged)

[behinger]

regarding which EEG dataset to use. Something around 1h per subject, at least 40 subjects,

one thing to keep in mind is, that we basically want "clean" EEG datasets, that is without breaks. not sure how to achieve. any ideas?

We could also directly summon richard gao + his PhD to just generate us with plenty of (single electrode) EEG