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Add high and low color settings for colormaps (HiLo mapping) (#2663)

As suggested by @aganders3 in
https://github.com/vispy/vispy/pull/2659#issuecomment-2786508704, based
on the discussion in https://github.com/napari/napari/issues/6878.

Note that this includes changes from #2662. What do you think
@aganders3?

You can try it out with this snippet:


```py
import sys
from vispy import scene, app
from vispy.color import get_colormap
import numpy as np


canvas = scene.SceneCanvas(keys='interactive', bgcolor='white')
canvas.size = 600, 800
view = canvas.central_widget.add_view()

img_data = np.zeros((500, 500), np.float32)
for i in range(10):
    img_data[i*50:(i+1)*50, :] = i

img_data[:, 20:60] = np.nan

image = scene.visuals.Image(img_data, 
                            cmap='fire',
                            clim=[1, 8],
                            interpolation='cubic', 
                            texture_format='auto')
view.add(image)

view.camera = scene.cameras.TurntableCamera()
view.camera.set_range()
canvas.show()
```

and then something like:

```
image.low_color = 'blue'
image.high_color = 'green'
```

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