Add hypo for time-significance based selection of HLT jets

This MR adds the TimeSignificanceCondition class to select jets at the HLT based on the significance of their delay. To be developed further before being put into production, but once marked ready the additions in this should be possible to merge in without causing any problems.

Longer-term improvements most importantly would include picking parameters for pT-dependent time resolution from a db or similar (instead of hardcoded). Tagging @mapatzwa who did the implementation for his MSc thesis, and @xingguo and @miochoa as jet trigger signature coordinators (and @cantel who previously held this role).

Also tagging @sfyrla and @jmontejo for info, as they've done work on similar things recently.