Support configuring relation summary stats off
Support configuring relation summary stats off

For databases with very large numbers of relations, these queries can be
prohibitively expensive to run every minute, so offer a way to turn them
off by setting `relation_stats: False`. (Still on by default, as very
large relation counts are not the typical case.)

notnmeyer/newrelic-plugin-agent,rounds/newrelic-plugin-agent,alonisser/newrelic-plugin-agent,NewRelic-Python-Plugins/newrelic-python-agent,whiteear/newrelic-plugin-agent,MeetMe/newrelic-plugin-agent,alonisser/newrelic-plugin-agent,NewRelic-Python-Plugins/newrelic-python-agent,whiteear/newrelic-plugin-agent,whiteear/newrelic-plugin-agent,MeetMe/newrelic-plugin-agent,alonisser/newrelic-plugin-agent,NewRelic-Python-Plugins/newrelic-python-agent,notnmeyer/newrelic-plugin-agent,rounds/newrelic-plugin-agent,ModusCreateOrg/newrelic-plugin-agent,notnmeyer/newrelic-plugin-agent,MeetMe/newrelic-plugin-agent,ModusCreateOrg/newrelic-plugin-agent,rounds/newrelic-plugin-agent,ModusCreateOrg/newrelic-plugin-agent