Updated KilosortBase's channel map generation to support json probe maps with kcoord information.

[nikhilchandra]

Fixes #3704

[alejoe91]

Thanks @nikhilchandra

See comments

[zm711]

This looks nice to me :)

[alejoe91]

@nikhilchandra why do you need to make tuples here when later you're making an array and squeezing it?

Couldn't you do this directly?

xcoords = positions[:, 0]
ycoords = positions[:, 1]
kcoords = groups

These are already 1d arrays, so then you could just do:

probe = {
            "chanMap": np.arange(nchan),
            "xc": xcoords,
            "yc": ycoords,
            "kcoords": kcoords,
            "n_chan": nchan,
        }

[nikhilchandra]

You are correct. I have made the necessary changes.

[alejoe91]

@nikhilchandra one final comment :)