Cron trigger support for step values greater than the maximum

**Is your feature request related to a problem? Please describe.**
I recently migrated a workload from Vixie cron to APScheduler, and discovered that the cron trigger only supports a subset of the Vixie crontab format.

Specifically, we had a couple of jobs configured with `*/60 * * * *` to run every 60 minutes. I assume this is equivalent to `0 * * * *`. cron accepted this, but APScheduler rejects it: https://github.com/agronholm/apscheduler/blob/d10f20215d8c78e9e2d32d634f276bb89f86ca38/apscheduler/triggers/cron/expressions.py#L34

That particular example isn't that useful, but it turns out that things like `*/90 * * * *` are also allowed.

**Describe the solution you'd like**
It would be nice to support this in APScheduler for greater compatibility with cron.