Add cache-control parser example that returns whether a given value is parsed or not

[RoyalIcing]

e.g. s-maxage will return { cachedByEdge: true, cachedByBrowser: false }

See also:

• https://mobile.twitter.com/BHolmesDev/status/1588168499507216384
• https://vercel.com/docs/concepts/functions/edge-functions/edge-caching