Allow `status_counter` metrics to be collected
Allow `status_counter` metrics to be collected

It turns out that MySQL is inconsistent in which metrics are in `SHOW
GLOBAL STATUS` and which are in `information_schema.innodb_metrics`.

Include all `status_counter` metrics as counters.

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