GraphQL: Remove underline from operators (parse-community#6024)

* Change _or, _and, _nor to OR, AND, NOR

* Renaming where operators maps

* Fix tests

* Fix tests

* Remove CreateResult and UpdateResult types

* Remove KEYS_ATT and INCLUDE_ATT

* Full text search test

* Change the operation generator functions names

* Fix object constraints

* Improve constraint transformation

Author: davimacedo