fix: Replace asyncio.gather() with aiotools.PersistentTaskGroup() for kernel creation tasks

[rapsealk]

This PR resolves #1128

[achimnol]

I think we need to refactor this part to use aiotools.PersistentTaskGroup.

[achimnol]

I have published aiotools v1.6.0 which introduces as_completed_safe() based on PersistentTaskGroup for this PR's use case.

Though, it requires Python 3.11 to handle timeouts correctly (this may be fixable but I don't have enough time now...) while its basic functionality still works with Python 3.10.

[rapsealk]

It spreads a traceback message when an Exception has raised. It works as expected except for this.

(venv) rapsealk@MacBook-Pro aiolabs % python main.py
Traceback (most recent call last):
  File "/Users/rapsealk/Desktop/git/aiolabs/venv/lib/python3.10/site-packages/aiotools/taskgroup/persistent_compat.py", line 163, in _task_wrapper
    ret = await coro
  File "/Users/rapsealk/Desktop/git/aiolabs/main.py", line 16, in random_task
    raise Exception(str(id))
Exception: 3
INFO:__main__:results: [0, 1, 2]
INFO:__main__:errors: [Exception('3')]

[CLAassistant]

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[achimnol]

This is on hold until I finish refactoring of aiotools with Supervisor and TaskScope.

[achimnol]

Under experimentation at achimnol/aiotools#58.