Resolve "(LearnerND) add iso-surface plot feature"

Closes #112 (closed)

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• 46f2d8d4 - add iso_surface_plot to adaptive learnerND

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Now there is :)

Quick demo:

import adaptive
adaptive.notebook_extension()

def f(xyz):
    x, y, z = xyz
    return x**4 + y**4 + z**4 - (x**2+y**2+z**2)**2


learner = adaptive.LearnerND(f, bounds=[(-1,1), (-1,1), (-1,1)])
runner = adaptive.Runner(learner, goal=lambda l:l.npoints>1000)
runner.live_info()

and when it's finished:

from ipywidgets import interact_manual
interact_manual(learner.plot_isosurface, level=(-5.99,-.01,0.01), hull_opacity=(0,1,0.2))

or

learner.plot_isosurface(level=-0.5)

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• b47cbb40 - fix style issues

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• 85243d94 - fix style issues

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• a2b5aca6 - import plotly only when using it

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• c1c1b872 - improve 'notebook_extension'

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• 9ed15f76 - improve 'notebook_extension'

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mentioned in merge request !127 (merged)