Safe and reliable fetch calls in TypeScript.

• src/not-typesafe.ts shows the most common mistake people make when using fetch in TypeScript.
• src/using-unknown.ts shows how to use unknown to make the code safer.
• src/streamlining-with-zod.ts shows how to use Zod to easily parse the response and make the code 100% typesafe and reliable.

To run the files, use esbuild-kit/tsx:

npx tsx src/not-typesafe.ts
npx tsx src/using-unknown.ts
npx tsx src/streamlining-with-zod.ts

If I'm doing something wrong, please let me know!