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add samplingPattern decoration to e-gamma clusters in PHYSLITE

Nils Erik Krumnack requested to merge krumnack/athena:physlite_sampling_pattern into main

For historic reason the sampling pattern is stored in the cluster object instead of as a decoration. To make this available for columnar analysis it also needs to exist as a decoration. For now that means we have two copies of it, but it was already agreed to drop it from the cluster object, so this is a temporary situation.

I did a brief test, and this seems to be about 6-7 bytes per event for the file I tried.

cc @gwatts @emmat @feickert @gstark @mavigl @linghua @goetz

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