Add support for file-like objects to mne.io.read_raw_edf()

[CJ-Wave]

Describe the new feature or enhancement

I would like to have support for file-like objects for the mne.io.read_raw_edf() function (specifically a bytesIO object)

Describe your proposed implementation

new capability to an existing method

Describe possible alternatives

Possible alternative is allowing for a kwarg to detect if it's a file-like object as opposed to a filepath, but shouldn't be necessary

Additional comments

It looks like fiff files have that functionality in mne.io.read_raw(), it would be fantastic if edf had that functionality as well

[larsoner]

Agreed this would be useful and I don't see any reason offhand why it would be a problem. Maybe some code in mne/io/fiff/raw.py could be refactored for this. Do you want to give it a try @CJ-Wave ?

[CJ-Wave]

Sure, I can give it a try.