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Updating MET to reduce stored variables

Zach Marshall requested to merge zmarshal/athena:21.2_PHYSLITE_MET_Patch into 21.2

The MET requires the pre-sampler fraction. This MR tries to pre-calculate the pre-sampler fraction, store it as a decoration on the jets, pass it along via both the baseline MET configuration and PHYSLITE configuration, and use it if available in METMaker. Should improve the issues seen in MET agreement with DAOD_PHYSLITE.

FYI: @elmsheus , @jcatmore , @mswiatlo , @maklein , @schae , @eschanet

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