Introduce InputType for optional values with undefined state #658
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Introduce wrapper class InputType for optional values that can be in 3 states: some value, null and undefined.
Update generation of input object types to utilize new InputType wrapper and don't serialize optional value if it's undefined.
Example of new version of generated input type: https://github.com/apollographql/apollo-android/pull/658/files#diff-3e61595a5be610256c7f274f6f95d5f5
Closes #652