add an init command to the new cli

[jyecusch]

The init command allows a user to start a new nitric project from scratch or within an existing application repository.

Closes: NIT-63

Examples:

Happy path:

nitric.init.happy.flow.mp4

When the nitric.yaml already exists

nitric.init.already.exists.flow.mp4

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Name	Status	Preview	Comments	Updated (UTC)
nitric-docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 11, 2025 6:04am

[davemooreuws]

Maybe add some welcome text or something informing the user of what is going to happen.

[davemooreuws]

Only create nitric.yaml after all options are selected / set.

Steps:

1. Do an init in a fresh folder
2. Enter name and description
3. Esc the program
4. Try doing nitric init again

[davemooreuws]

Somehow I hit enter with no name and it does this:

[davemooreuws]

First enter on description does nothing:

Steps:

1. nitric init
2. enter project name
3. hit enter for description
4. nothing happens
5. hit enter again
6. it moves past it