Add ``widths``, ``heights`` and ``angles`` setter to ``EllipseCollection``

The ``widths``, ``heights`` and ``angles`` values of the `~matplotlib.collections.EllipseCollection`

can now be changed after the collection has been created.

.. plot::

:include-source: true

import matplotlib.pyplot as plt

from matplotlib.collections import EllipseCollection

import numpy as np

rng = np.random.default_rng(0)

widths = (2, )

heights = (3, )

angles = (45, )

offsets = rng.random((10, 2)) * 10

fig, ax = plt.subplots()

ec = EllipseCollection(

widths=widths,

heights=heights,

angles=angles,

offsets=offsets,

units='x',

offset_transform=ax.transData,

)

ax.add_collection(ec)

ax.set_xlim(-2, 12)

ax.set_ylim(-2, 12)

new_widths = rng.random((10, 2)) * 2

new_heights = rng.random((10, 2)) * 3

new_angles = rng.random((10, 2)) * 180

ec.set(widths=new_widths, heights=new_heights, angles=new_angles)