charts: make data collection scope configurable

[kilpatty]

Right now we just default the chart data collection to daily. We do this by using some calculation on all the chart data for all the blocks that day and then only store that object (Max, average, etc).

In the early days of the network, this is going to render charts not very useful. It would be great to be able to make the data collection configurable, perhaps even to the point where we keep 30days of tick data, and then only after 30 days does it go into averages... Would be great to make that 30 days configurable as well.

That being said, this kind of configuration might take a toll on performance, so if this is ever rewritten in Rust, I'd say its a good priority to have, but for now we can just backlog this.