Add colelction api class
Add colelction api class


Former-commit-id: ab0cb2120f4b944c2a9c22173ca3c4cea9fb3efd
Former-commit-id: d0fe72bda76a35286154b12741bf943ae64cacbf
Former-commit-id: cda6b5eda69fedaeb58e25e3f94ab5dd19dd5a0e
ONSdigital/florence,ONSdigital/florence,ONSdigital/florence,ONSdigital/florence