[FDC] Provide flutter as an option during init dataconnect

[fredzqm]

Success Demo

https://screencast.googleplex.com/cast/NDgyNDA3MzU1MjAwMzA3MnxhMGIzMjEwYS1mMQ

When npx or flutter isn't installed:

[gemini-code-assist]

Summary of Changes

Hello @fredzqm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the firebase init dataconnect command by integrating Flutter as a new app template choice, streamlining the setup process for Flutter developers. Additionally, it refactors a core utility function, centralizing it for improved reusability and maintainability across the codebase.

Highlights

• New App Template Option: The firebase init dataconnect command now includes Flutter as a selectable app template option, allowing users to quickly set up new Flutter projects.
• Utility Function Centralization: The commandExistsSync utility function has been relocated to src/utils.ts, making it more broadly accessible and improving code organization.

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[gemini-code-assist]

Code Review

This pull request adds Flutter as an option for creating an app template during init dataconnect. The changes include adding a createFlutterApp function, updating the interactive prompt to include Flutter, and refactoring the commandExistsSync utility function to a more general location. The implementation is solid. I've suggested a small refactoring to improve code clarity and avoid redundant filesystem calls.

[fredzqm]

[No rush at all, P2 no dealine]

@maneesht I think you will like this change~

[fredzqm]

Addressing feedback from a different PR #9072 (comment)

[maneesht]

LGTM, thanks for adding this