many changes in dev
many changes in dev

- added a validator for adUnit
- added a func validateSizeArray
- added a func generateSlotName
- added a func storeInSlotsMap
- comment that explains the input
- added a func customServerExposedAPI

PubMatic/OpenWrap,PubMatic/OpenWrap,PubMatic/OpenWrap,PubMatic/OpenWrap