feat(cli): add support for multiple registries

[smithgeek]

Added a new registry command with add and remove subcommands that can add named registries to the components.json file. The add, diff, info and migrate commands were also updated to take a -r --registry my-registry option to specify what registry to use. If none is specified it will default to the shadcn registry. Registries can override the style and aliases used by the main config, but if not specified the main config values will still be used.

The init command now also prompts the user for the primary registry to use (defaulting to shadcn). This adds a url property to the config that if set will be used as the primary registry. If not set shadcn will be used.

This adds a new section to the components.json file for named registries

{
  ...
  "url": "http://new-default-registry",
  "registries": {
    "my-registry": {
      "url": "http://localhost:3001/registry",
      "style": "default",
      "aliases": {
        "components": "@/my-registry/components",
	"utils": "@/my-registry/lib/cn",
	"ui": "@/my-registry/components/ui",
	"lib": "@/my-registry/lib",
	"hooks": "@/my-registry/hooks"
      }
    }
  }
}

Then when running other shadcn commands if you provide a -r my-registry option the cli will use the new registry while defaulting to shadcn if no registry is provided.

[vercel]

@smithgeek is attempting to deploy a commit to the shadcn-pro Team on Vercel.

A member of the Team first needs to authorize it.

[shadcn]

@smithgeek how similar is the implementation to #4950?

[vercel]

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[smithgeek]

looks similar, but that one has more features.