Revert "Switch from function() style to => in transaction method callbacks."
Revert "Switch from function() style to => in transaction method callbacks."

Rest parameters syntax (i.e. the ...args syntax) is not supported in older
versions of NodeJS. Hence the revert.

This reverts commit cd7f4b684ab34e2098a2de4317a305fcc82e2e1e.

pekim/tedious,tediousjs/tedious,tediousjs/tedious