add a new api to get the list of visualizations linked with a metric by metric_id
add a new api to get the list of visualizations linked with a metric by metric_id

almey/policycompass-services,mmilaprat/policycompass-services,policycompass/policycompass-services,policycompass/policycompass-services,almey/policycompass-services,policycompass/policycompass-services,mmilaprat/policycompass-services,almey/policycompass-services,mmilaprat/policycompass-services