feat: support for `feeByEvent` query param which will abstract the fees by events (#970)

* add query param feeByEvent to all applicable controllers

* add compare integers

* support for query param feeByEvent

* fix grumble

* fix compare.spec.ts

* inline comments

* add tests for getPartialFeeByEvents

* change error message

* create mock event data

* remove unneccessary comments

* add tests getPartialFeeInfo

* export constructEvent

* docs

* provide a better description for feeByEvent in docs

* create areFeesSimilar

* create findEvent