Construct a CommonSchemaInfo for testing (#505)
Construct a CommonSchemaInfo for testing (#505)

* Add Backend class

* Add docstring

* Fix docstring

* Simplify

* Remove testing functionality from Backend

* Edit comment

* Isort

* Construct a CommonSchemaInfo for testing

* Resolve merge conflict

* Add docstrings

kensho-technologies/graphql-compiler,kensho-technologies/graphql-compiler