WIP: Displaced jet line

@wbarter @rjhunter @olupton @yqiu @cvazquez @hyin @ncooke this is my first attempt in writing an HLT2 line for a displaced jet. I'm pretty sure that there are some errors, so I marked this MR as WIP. I've added the displaced jet line definition in Hlt/Hlt2Conf/python/Hlt2Conf/lines/QEE/DisplacedJet.py and it has been added in Hlt/Hlt2Conf/python/Hlt2Conf/lines/QEE/init.py. In order to check if it's working I've used some b-dijets simulated data from Murilo (you can found them here: https://gitlab.cern.ch/lhcb/Moore/-/blob/dev_hlt2jets/Hlt/Hlt2Conf/options/testrun_jetsrun3_forntuple.py). I've also created a file Hlt/Hlt2Conf/options/hlt2_QEEjets_example.py where Murilo's data are used. The line fires with an efficiency of (2.40+-0.48)%, which I guess sounds reasonable since b-dijets in Murilo's data are prompt.