[FR] Implement Automation to Support Test Driven Design (TDD) in Dialogflow CX Agents

[kmaphoenix]

Is your proposal related to a problem?

As a user, I need a way to author Dialogflow CX Test Cases outside of the console/IDE.
Preferably, this can be in a format that is easily human-readable like Google Sheets or YAML.

Describe the solution you'd like

• Implement a Test Case Builders class to support creating the Test Case Protos
• Implement a Test Case Utils class that offers several methods including:
  • Converting a Google Sheet of Test Case data into a List of Test Case Protos ready for upload
  • Converting a YAML file of Test Case data into a List of Test Case Protos ready for upload
  • Methods for parsing inputs from all formats
  • Methods for validating input from all formats

Additional context

A primer on Test Driven Development and why it can be a powerful paradigm for designing Dialogflow CX Agents.