[Feature] Add a generate subcommand

[YourTechBud]

The problem faced currently?

We need to manually create a OpenAPISource for each worker made using this library. It would be great if we could automatically generate it.

How can we solve it?

• Add a generate command in cobra
• This will generate the openapi.json file in memory but will not start/ begin the server
• The URL will be taken via a flag
• It will instead generate an OpenAPISource object in the resources directory of that package
  • Ref: [Feature] Add support for basic package management in spacectl space-cloud#1665
  • Throw an error if the current working dir ($PWD) or parent of current working directory does not have a sc folder with a package.json file.

If you want this feature to be implemented, give it a thumbs up reaction, so that we can determine which features are important to you.
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