Update the questionnaire view model logic to update the pre-order trace and questionnaire parent map

[jingtang10]

Is your feature request related to a problem? Please describe. See comment: https://github.com/google/android-fhir/pull/1496#discussion_r925369845

Describe the solution you'd like Just have to update these lists whenever nested items are being created, and then add test cases

Describe alternatives you've considered NA

Additional context NA

Would you like to work on the issue? me or @joiskash