Add a MaxBps and MaxPps packets computed over a short period (eg. 1 minute)

[vincentbernat]

This would be used to compute a maximum value that does not change with the resolution of the aggregated table. Currently, if you look at a specific day and zoom out to see the month, the maximum is likely to be lower (it switches from the maximum of the averages over one minute, to the maxium of the averages over 5 minutes). This does not seem trivial to implement in ClickHouse.