[issue17005] Add a topological sort algorithm

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

`functools` is clearly a poor place for this. `imath` would also be. `graph_stuff_probably_limited_to_a_topsort` is the only accurate name ;-) Off-the-wall possibilities include `misclib` (stuff that just doesn't fit anywhere else - yet) and `cslib` (Computer Science-y stuff).

Whichever name wins, we should probably look to ensure the name isn't also of a package already in (non-trivial) use.

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