pdm: support defining function on supply lines

We make it possible to define function the same way it's currently possible to define accounts. The idea is similar: to be able to use this information in accounting generation rules.

The typical accounting generation configuration using this will use the function defined on the supply line if any is defined and with a fallback to the function defined on business process' trade model path.

For now we don't introduce such configuration by default, but this may become part of the configuration generated by configurator some day.