Get listing chart by collection

Return the number of listings chart data on a given time range,
including a series of value x and value y. x is a timestamp in second and y is the number of listings in corresponding time.

If (now - end_time <= 5 minutes) and (end_time - start_time <= 6 hours), the interval between two time points will be 5 minutes,
otherwise the interval will be 1 hour

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