Krikri::PluginHelpers::MysqlInfoVersion
MysqlInfoVersion - parses a SELECT VERSION() string into the
version: fact shape real community.mysql.mysql_info reports
(its own __get_global_variables): split on '.', take release/suffix
from the THIRD component only, and leave full unmodified. Kept
out of plugins/mysql_info.cr itself so it can be unit-spec'd
without pulling in the plugin binary's STDIN entry point.