Add a section to the docs on sort_by/filter_by/group_by shape property

[gumyr]

As a replacement for the SortBy functionality of the ShapeList, one can use class properties, like:

shape.edges().filter_by(Edge.is_interior)

or

from itertools import product

from build123d import Box, ShapeList, Solid, Vertex
from ocp_vscode import ColorMap, show

boxes = ShapeList(
    Box(1, 1, 1).scale(0.75 if (i, j) == (1, 2) else 0.25).translate((i, j, 0))
    for i, j in product(range(-5, 6), repeat=2)
)

# sort by distance to origin
boxes = boxes.sort_by(Vertex().distance)
show(*boxes, colors=ColorMap.listed(len(boxes)))

and

# sort by distance to largest box
boxes = boxes.sort_by(boxes.sort_by(Solid.volume).last.distance)
show(*boxes, colors=ColorMap.listed(len(boxes)))