CLI: Add string validation for integration names

[talagluck]

Currently, it is possible to specify an integration name in the CLI package initialization flow that will show up as invalid when you try and publish the package. This PR adds a string validation step that uses the same criteria as the API to make sure the string is valid.

I copied the validation functions directly since this repo is public, while the gitbook-x repo is private. I'm happy to update this if there's a better way to import that validation function directly here.

[changeset-bot]

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Latest commit: d714d44

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[pkg-pr-new]

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bun add https://pkg.pr.new/GitbookIO/integrations/@gitbook/api@763

commit: d714d44