Add option to run the full HLT2 reconstruction in HltEfficiencyChecker jobs

FYI @rmatev @sstahl @mvesteri

As titled. There is a new run_reconstruction flag that can be specified in the yaml, and the "by-hand" hlt2_eff_example.py uses with reconstruction.bind(from_file=False). As such all the HLT2 HltEfficiencyChecker examples run the reconstruction by default.

On a side note, the possibility of plotting with logx is added as requested by Mike Solokoff in RTAGeneral on Friday.

TODO:

• Update the doc examples (add myself as CODEOWNER for the docs while I'm there)
• Make the rate examples use the reconstruction too
• Add a test that still runs reco from file.