Add in Chat Style UI to the Quickstart Playground

[chenss3]

Summary of the pull request

• refines the completions file
• allows the user to chat with the ui to refine their prompt to make an acceptable prompt

References and relevant issues

• #3908 SDK change for Dev Home needs to be completed first
• #3913 Dev Home code modifications is conjunction with this PR

Detailed description of the pull request / Additional comments

• implements the new provider and interface

Validation steps performed

PR checklist

• [ ] Closes #xxx
• [ ] Tests added/passed
• [ ] Documentation updated