implement add commands

[pistachiobaby]

Implements the add commands for generating routes, actions, fields, and models in a gadget project. All from the CLI.

Example of some of the commands that have been adde:

// adding a model

ggt add model post # adds a post model at api/models/post
ggt add model myNamespace/post # adds a model at api/models/myNamespace/post

ggt add model post title:string # adds a model at api/models/post and a title field with type string

// adding a field
ggt add field post/body:string # adds a field body with type string to the post model

// adding an action

ggt add action post/publish # adds a model action at api/models/post/actions/publish.js
ggt add action doAThing # adds a global action at actions/doAThing.js
ggt add action nested/doADifferentThing # adds a global action at actions/nested/doADifferentThing.js

// adding a route
ggt add route GET hello-world # adds a route at api/routes/GET-hello-world.js
ggt add route profile # adds a frontend route at web/routes/profile.jsx

Everything is done through the gadget edit api, that way ggt doesn't sweat about the actual implementation of generating these files.

Should be merged in once, https://github.com/gadget-inc/gadget/pull/11187, is merged into main.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2fc7ea3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
ggt	Patch

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[scott-rc]

Nice! LGTM 👍

Don't forget to add a changeset so that our CHANGELOG is updated when we release this. There are docs on how to add a changeset here: https://github.com/gadget-inc/ggt/blob/main/CONTRIBUTING.md#pull-requests

[scott-rc]

Couple more nits, but still looks great! 👍

[jcao49]

Looks good!! 👍