Added Builder to Questionnaire Fragment.

[aditya-07]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #1848

Description

1. Added Builder to QuestionnaireFragment so that the application developers don't have to lookup appropriate keys for Bundle args.
2. Made QuestionnaireFragment closed and added QuestionnaireItemViewHolderFactoryMatchersProvider and QuestionnaireItemViewHolderFactoryMatchersProviderFactory that can now be used by application developers to add custom QuestionnaireItemViewHolderFactory to the questionnaire.

Alternative(s) considered
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Checklist

• I have read and acknowledged the Code of conduct.
• I have read the Contributing page.
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA.
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project.
• I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally.
• I have built and run the demo app(s) to verify my change fixes the issue and/or does not break the demo app(s).