feat(clerk-js): Improve fetch type safety and handle token network error

[desiprisg]

Description

Checklist

• npm test runs as expected.
• npm run build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

Packages affected

• @clerk/clerk-js
• @clerk/clerk-react
• @clerk/nextjs
• @clerk/remix
• @clerk/types
• @clerk/themes
• @clerk/localizations
• @clerk/clerk-expo
• @clerk/backend
• @clerk/clerk-sdk-node
• @clerk/shared
• @clerk/fastify
• @clerk/chrome-extension
• gatsby-plugin-clerk
• build/tooling/chore

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Latest commit: 9c6ec3c

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Name	Status	Preview	Comments	Updated (UTC)
javascript	❌ Failed (Inspect)			Nov 6, 2023 10:15am

[nikosdouvlis]

@desiprisg good job on this one. I've read all of your code and I'm adding this concern to the re-architecture project we're working on currently. I'm closing this one as we'll refactor the fapi client and the resources but this is the approach we'll most likely take :)