Include tdbstats generation in db build entrypoint

[recalcitrantsupplant]

https://jena.apache.org/documentation/tdb2/tdb2_cmds.html#:~:text=other%20applications%20running.-,tdb2.tdbstats,placed%20in%20the%20Data%2DNNNN%20directory%20(Data%2D0001/stats.opt).,-On%20this%20page

[recalcitrantsupplant]

I've never used this but we should try to