Add Client side create button to the dev app

[ugochukwu-stripe]

Summary

Add Create Client Side switch to the dev test application, when enabled it’ll create payment intents using the terminal sdk, and when disabled it’ll create payment intents via the stripe api. Client side create is always disabled for p400 readers as it doesn’t support that functionality.

Motivation

So testing create PI -> retrievePI -> collect path does not require code changes.

Testing

• I tested this manually
• I added automated tests

Documentation

Select one:

• I have added relevant documentation for my changes.
• This PR does not result in any developer-facing changes.