Adding Contur package for BSM interpretation using SM measurements

Peng Wangrequested to merge
pengwa/athena:contur-dev into main

Added Contur_i directory to help with setting up the right environment for CONTUR package (produces particle-level exclusion using SM measurements.)

Contur should be compiled after event generation and Rivet as an "off-line" afterburner.

Addresses this JIRA Ticket

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