[BUG]unnecessary check for slidingWindowMetric.intervalInMs

[novoland]

Issue Description

Type: bug report

Describe what happened

As SlidingWindowMetric is designed as a VIEW to provide recent stats for a leapArray, the check below is unnecessary:

if parentIntervalInMs%intervalInMs != 0 {
		panic(fmt.Sprintf("SlidingWindowMetric's intervalInMs(%d) is not divisible by real BucketLeapArray's intervalInMs(%d).", intervalInMs, parentIntervalInMs))
	}

Describe what you expected to happen

remove the check