OK-485 Hakemusmaksut

[vaeinoe]

This ended up being the main feature branch and "monolithic" feature PR for hakemusmaksut and other related ataru backend features.

• New fields to form properties for payment type and default / hardcoded fees for processing and decision phases
• API endpoint & service code for setting payment information (excluding kk / hakemusmaksut)
• Inference logic for setting kk / hakemusmaksut payment info for a form based on given haku
• Parse tutkintoon johtava & kohdejoukon tarkenne, used for the hakemusmaksu inference
• Hakemusmaksu is dynamically determined by haku & hakukohde properties, so add it to form and haku on the fly whenever needed (from OK-529 dynamically add hakemusmaksu to form data when editing / filling #1560 )
• Record hakemusmaksu state as a property of a person (with OID) to the database (from OK-553 hakemusmaksu payment states #1564 )
• Logic for determining which persons and hakus need payments and what the state of the payment ought to be in case of linked oids and state conflicts (from OK-556 payment state logic for hakemusmaksu #1574 )

To avoid rounding errors and other weirdness, the payment sums are stored as decimal number strings (like with the current TUTU) and the internal payment validation / setting logic is done as BigDecimals.

[vaeinoe]

Rebase tuoreimman masterin päälle.

[vaeinoe]

Rebase tuoreimman masterin päälle.