Fix camel case inconsistency

[smkhalsa]

fixes #224

[vishalrao8]

How can one use your fix before it is merged into master and released on pub dev? And I am using ferry_generator which depends on gql_code_builder so I have not explicitly added this library as it's already a dependency for ferry.

[smkhalsa]

@vishalrao8 I just rebased, so you should be able to set a dependency override on this PR's commit.

I've been having issues with multipack which is causing some tests to fail.

Once #192 is merged, I should be able to merge this.

[vishalrao8]

I can't find any way to put dependency override for this particular PR in pubspec.yaml file.

[aquadesk]

pull this repo in your local and checkout the commit and do

dependency_overrides:
  gql_code_builder:
    path: ../../../gql/codegen/gql_code_builder