Add flag to Engine.terminate(skip_complete_event: bool = False)

[vfdev-5]

🚀 Feature

Add flag to Engine.terminate(skip_complete_event: bool = False) to optionally skip Events.COMPLETE when terminate was called.

Context:

• https://discuss.pytorch.org/t/average-time-per-epoch-calculation-on-pytorch-ignite/82506/10?u=vfdev-5

[github-actions]

Hey 👋, I've just created a thread for this issue on PyTorch-Ignite Discord where you can quickly talk to the community on the topic.

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[bonassifabio]

Hi, I tried to implement this in the pull request #3309

[vfdev-5]

This issue can be closed as completed by #3309 PR