Preliminary QMtest for GenFSRJson component

Alex Grecurequested to merge
agrecu/GenFSRJson-test into master

Adding some basic test for GenFSRJson component in order to run the algorithm in Gauss tests. Minor supplemental changes will be needed once the output JSON format is better defined.

Needed by LHCb!3384 (merged)

Edited by Peilian Li

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