Provide a simple function interface for topological sort in graphlib

Feature or enhancement

Proposal:

The graphlib interface requires 5 function calls in order to get the result of a topological sort.

I believe that the most common user will most likely only need a single function call, i.e.

def topological_sort(graph: dict) -> Iterable[set]: ...

I propose adding this small utility function to graphlib.

Note: there is static_order(), which reduces it to 2 function calls, but it flattens the result, which is a bad default.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

此 issue 涉及 graphlib 及其現有的 static_order() 介面；首先找出該實作及其周圍的 graphlib 測試。完成的標準是加入所提議的單次呼叫 topological_sort(graph) 介面，使其輸出分組集合，並涵蓋其行為。