PubMatic Analytics Adapter (prebid#5024)

* first commit :)

* added event handlers

* in-dev chnages, need to remove a lot of code

* moved strings to const

* still in-dev

* added profileId profileVersionId in config

* added some todos

* added support for pubcommon, digitrust, id5id

* added support for IdentityLink

* changed the source for id5

* added unit test cases

* changed source param for identityLink

* corrected end-points and size formatting

* fixed db flag

* dealId and dealChannel are set

* passing kgpv

* passing ocpm and ocry

* commented un-necessary code, to be deleted later

* added a todo

* marking wb and added some const

* in-dev changes

* in-dev changes

* bid-win logger added

* deleted un-necessary code

* adding a unit-test code

* writing unit test cases

* default value for l1

* writing some more unit test cases

* unit test case for timeout case

* logger currency unit test case added

* execute win-tracker using ajax

* win-tracker unit test case

* fixed a typo

* added pdomain in logger call

* l1 should be 0 if no response (needs secnd thought)

* added bidderDonePendingCount logic and a todo

* changed pdomain to orig

* added gdpr support, unit test cases pending

* moved some code to new setMediaTypes function

* added a new function getHighestBidForAdUnit

* moved some code to a function

* added GDPR related unit test case

but this case-data always adds gdpr config to request

* removed a todo

* removed un-necessary objects

* default timeout = 2000ms

removed unnecessary code

* execute logger at 500ms if all bidders have responded else 2000ms

* removed reference of utils.getTopWindowUrl

* tst should be in seconds; updated test cases as well

* added kgpsv in logger call

* gdpr flag fix

* originalCpm and originalCurrency

* added test cases

* chnaged logic for ss field, also changed test cases to always s2s

* moved s2sBidders setting logic to auction init