[CLI] Improve Init Command

[cstrnt]

Problem
The current initcommand is quite basic and doesn't provide much value. It requires a lot of manual work and doesn't align with Abby's level of UX/DX

Solution:
The init command should provide a full hands-on experience. The shadcn CLI is a great example of that (reference).

Potential Workflow:

1. User runs Abby init
2. Ask for the location (should default to the current dir)
3. If there is an abby.config.ts warn the user and abort.
4. Get a list of all projects available for the signed-in user
5. Show the user a list of all projects (select)
6. Let the user select a project
7. Fetch all existing items for the current project (environments, flags, remote configs, tests)
8. Show the user an overview of the config that will be written to the file
9. Allow the user to accept or cancel

Acceptance Criteria:

• User errors are caught and displayed in a nice manner
• the currentEnvironment field should be set to process.env.NODE_ENV by default
• all existing data must be set for the projects

[Ekep-Obasi]

Hi @cstrnt, I'll love to contribute. Can you assign this to me?

[cstrnt]

@Ekep-Obasi Sure thing! Thank you so much :) Feel free to always ask questions if you need help or join our Discord

[cstrnt]

Hey @Ekep-Obasi Is there anything you need assistance with?

[Ekep-Obasi]

@cstrnt , I've pinged you on discord