OPENTHREAD_CONFIG_TX_QUEUE_STATISTICS_HISTOGRAM_BIN_INTERVAL macro

@def OPENTHREAD_CONFIG_TX_QUEUE_STATISTICS_HISTOGRAM_BIN_INTERVAL Specifies the time-in-queue histogram bin interval in milliseconds when the TX queue time-in-queue statistics collection feature is enabled. The number of bins is calculated by dividing `OPENTHREAD_CONFIG_TX_QUEUE_STATISTICS_HISTOGRAM_MAX_INTERVAL` by `OPENTHREAD_CONFIG_TX_QUEUE_STATISTICS_HISTOGRAM_BIN_INTERVAL` and rounding up to the nearest integer.