[backport] interval_trigger using previous_epoch_detail #3151
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Backport of #2484
Be careful that this PR changes existing APIs. Specifically, this PR:
iter_per_epoch
argument with the default value toget_trainer_with_mock_updater
.serialize
method toIntervalTrigger
.As we declared in the contribution guide, we do not add any feature to revision updates basically. But as this PR introduced new features to fix bugs in stable versions. We propose to backport the PR. In order to make it clear that newly-added APIs are not documented (therefore not officially supported), we do not add documents to these APIs intentionally.