Detect N+1 queries

When someone wrote a new piece of code including a query to a database, it is possible that query leads to the N+1 query problem (when the code needs to load the children of a parent-child relationship, queries being issued for the parent record, and then one query for EACH child record), which is something we need to avoid. So it would be helpful if a mechanism is added to check if such queries exist in the code and would help future contributors of the project too.