Statistics route with general info, some user and total posts stats

By default statistics off, enabled in settings. You can see the results here on my pod: https://iliketoast.net/statistics.json

Only json for now, HTML page to be added. And limited stats only at the moment.

Opinions, technical or idea?

My plan is to set up a statistics monitoring site (already half done), but of course this route could be used by the other pod lists too where it is enabled.