Draft: NXCALS-4920 Create perf test project and include gatling

Rafal Mucharequested to merge
feature-NXCALS-4720-create-performance-test into develop

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Adds simple performance tests and jenkins pipeline for it: http://nxcals-jenkins-master.cern.ch:8080/view/NXCALS/job/nxcals-performance-tests

Closes NXCALS-4920

Edited by Rafal Mucha

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