Support eachpoint with `cq.Shape` and `cq.Workplane` in addition to callbacks

[adam-urbanczyk]

E.g.

b = cq.Workplane().box(2,2,2)
s = cq.Workplane().sphere(0.5)

res = b.faces().eachpoint(s)

[dov]

@adam-urbanczyk In continuation of your comment on #1574 , I would add cq.Wire in addition to cq.Shape and cq.Workplane to this issue.

[adam-urbanczyk]

cq.Wire is a cq.Shape

[dov]

@adam-urbanczyk I got it working for a Shape by renaming the argument arg and dispatching on its type. However I need some guidance about what semantics you expect for a Workspace. Just moving the workspace by the following lambda obviously does not work:

        if isinstance(arg, Workplane):
            wp = arg
            callback = lambda v : wp.move(v)

[adam-urbanczyk]

Something like this:

v.moved(loc) for v in arg.vals() if isinstance(v, Shape)

[dov]

Something like this:

v.moved(loc) for v in arg.vals() if isinstance(v, Shape)

Thanks @adam-urbanczyk . In my PR I used the following. Let me know this is what you intended.

res = [
    v.moved(p).move(loc)
    for v in arg.vals()
    for p in pnts
    if isinstance(v, Shape)
]