pt-stalk on MySQL 8 not collecting "lock" information

The pt-stalk tool has on the code:

  local have_lock_waits_table=""
   $CMD_MYSQL $EXT_ARGV -e "SHOW TABLES FROM INFORMATION_SCHEMA" \
      | grep -i "INNODB_LOCK_WAITS" >/dev/null 2>&1
   if [ $? -eq 0 ]; then
      have_lock_waits_table="yes"
   fi

However, in MySQL 8 this table was migrated to PS. I suggest we start using the following table for MySQL 8:

sys.innodb_lock_waits 

It contains a lot of information and pretty much resumes the necessary analysis for lock situation.