feat(api): small CLI quality-of-life changes

[kanadgupta]

🚥 Resolves RM-8193

🧰 Changes

This PR rips a couple pages from the rdme playbook:

• Brings in update-notifier to ensure people are using the latest and greatest updates. People are unlikely to have this CLI globally installed, but it will still be valuable since npx caches versions.
• Similar to rdme, we now detect whether the api CLI is being run from a CI environment and throw an error if the user attempts to prompt for something.

🧬 QA & Testing

The update-notifier changes are minimal enough and the package is weird enough where it's not particularly easy nor worth it to QA, but I confirmed that the CLI still works!

As for the prompt handler changes, you can check out this branch and try running the following command:

CI=true npm run debug:bin install https://raw.githubusercontent.com/readmeio/oas-examples/main/3.0/json/petstore-simple.json

It should error out with an output like this:

> api@7.0.0-beta.4 debug:bin
> NODE_OPTIONS=--no-warnings node --loader ts-node/esm src/bin.ts install https://raw.githubusercontent.com/readmeio/oas-examples/main/3.0/json/petstore-simple.json

- Fetching your API definition
✔ Fetching your API definition

Yikes! Looks like we were about to prompt you for something in a CI environment. Are you missing an argument?

Try running `api <command> --help` to get more information.

npm ERR! Lifecycle script `debug:bin` failed with error: 
npm ERR! Error: command failed 
npm ERR!   in workspace: api@7.0.0-beta.4 
npm ERR!   at location: /Users/kanadg/Code/readmeio/api/packages/api