Handle executor's schedule/checkin return value

[RainMark]

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What happened + What you expected to happen

async_simple/async_simple/coro/ViaCoroutine.h

Line 66 in 5d14230

pr._ex->checkin(func, _ctx);

If executor's checkin method returned false and task not be executed, this may caused the lazy can not resumed.
We should handle the return value, how about to add the logicAssert?

Reproduction way

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!