Figure.fill_between: Add parameter 'no_clip' to not clip curves outside the border

[seisman]

Example:

import numpy as np
import pygmt
x = np.linspace(0, 2 * np.pi, 200)
fig = pygmt.Figure()
fig.basemap(region=[0, 1 * np.pi, -1.2, 1.2], projection="X10c/4c", frame=True)
fig.fill_between(
    x=x,
    y=np.sin(2 * x),
    y2=np.sin(3 * x),
    fill="lightblue",
    pen="1p,blue",
    fill2="lightred",
    pen2="1p,red",
    no_clip=True,
)
fig.show()

Address #4678