[ENH] Add methods to initialize an EnsembleImplant from a list of coordinates

[tallyhawley]

Description

Adds two methods to initialize an EnsembleImplant from a set of coordinates. This should generally match the format of Neuralink.from_neuropythy().

EnsembleImplant.from_coords() allows the user to pass an implant type (must subclass ProsthesisSystem) & a set of locations on the cortex/retina (in µm), or an xrange/yrange/xystep in µm. We then automatically create a set of implants of the given type at the desired locations.

EnsembleImplant.from_cortical_map() takes the same parameters as from_coords() in addition to a vfmap (must be a CorticalMap instance and implement from_dva()) and region (defaults to v1). Locations/coordinates are passed to this function in dva, and internally converted to µm (in the given region).

Possible expansion: from_retinal_map(). Not implemented currently due to lack of use-cases as retinal implants are generally stand-alone. Would take an eye parameter instead of region?

Type of Change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

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Additional details and impacted files

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[jgranley]

Looks great!