[issue41756] Do not always use exceptions to return result from coroutine

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> I think it should be specific to generators and coroutines. Calling `PyObject_CallMethodIdOneArg(coro, &PyId_send, arg);` and interpreting exceptions to emulate the low level API seems a bit too much.

To add to my point: typically higher-level APIs go under the `PyObject_*` namespace, whereas `Py{Type}_*` is more concrete. So I'd make `PyGen_Send` to only work with `PyGen` and `PyCoro`.

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<https://bugs.python.org/issue41756>
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