Grafana installation and configuration documentation. [ci skip]

doc/monitoring/performance/grafana_configuration.md

...monitoring/performance/img/grafana_dashboard_dropdown.png

doc/monitoring/performance/img/grafana_dashboard_import.png

...ing/performance/img/grafana_data_source_configuration.png

doc/monitoring/performance/img/grafana_data_source_empty.png

doc/monitoring/performance/img/grafana_save_icon.png

doc/monitoring/performance/introduction.md