Add auto_increment column metrics
Add auto_increment column metrics

Add metrics for reporting the current value of auto_increment columns

Based on the reporting query:
https://github.com/SuperQ/bk-tools/blob/master/pk-full-ratio.sql

prometheus/mysqld_exporter,growbots/mysqld_exporter,roman-vynar/mysqld_exporter,prometheus/mysqld_exporter,rtreffer/mysqld_exporter,roman-vynar/mysqld_exporter