MBL-1251 get create attribution event graphqltransformer

[ycheng-kickstarter]

📲 What

This PR is for step 4 of https://kickstarter.atlassian.net/wiki/spaces/NT/pages/2699100255/Event+Attribution+Engineering+Plan+AKA+How+To+Wire+Up+a+New+GraphQL+Endpoint+on+Android

🤔 Why

CreateAttributionEventData is the corresponding internal data model to the GraphQL model [CreateAttributionEventInput]. This transformer converts CreateAttributionEventData → CreateAttributionEventInput → CreateAttributionEventMutation for the Apollo client to use

🛠 How

More in-depth discussion of the change or implementation.

👀 See

Trello, screenshots, external resources?

Before 🐛	After 🦋

📋 QA

Instructions for anyone to be able to QA this work.

Story 📖

https://kickstarter.atlassian.net/browse/MBL-1251

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 72.69%. Comparing base (f6c5d30) to head (f214732).

Files	Patch %	Lines
...arter/services/transformers/GraphQLTransformers.kt	0.00%	10 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1969      +/-   ##
============================================
- Coverage     72.73%   72.69%   -0.04%     
  Complexity     1980     1980              
============================================
  Files           350      350              
  Lines         20220    20230      +10     
  Branches       2808     2808              
============================================
  Hits          14707    14707              
- Misses         3894     3904      +10     
  Partials       1619     1619              

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