Add NamingConventions::Field::FQN
Add NamingConventions::Field::FQN

Given

* a model with storage_name = ‘accounts’
* a property with name = ‘name’

returns ‘account_name’

This is useful for defining database schemas which need minimal
renaming for natural joins

ar-dm/ardm-core,datamapper/dm-core,tpitale/dm-core,tillsc/dm-core