Move 2PT match and allocate logic to own folder

https://eaflood.atlassian.net/browse/WATER-4739

Following on from our work in [Tidy up two-part tariff review code and routes](#1443) this change moves the two-part tariff match & allocate logic into it's own folder. This will hopefully help us distinguish what aspect of two-part tariff a module relates to.

Unlike the previous change though, we're having to turn a blind eye to any issues or ways we can clean things up. Time is not on our side! So, it's just moving the modules.