Function cacheMatch

Try to return a response from cache

• if {ifNoneMatch: true} is set, we are passing ETag value from cache response to the request 'if-none-match' header for data validation.
• if {ifMatch: true} is set, we are passing ETag value from cache response to the request 'if-match' header for data validation.

const req = new Request('http://localhost:3000/api/v1/health');
const cacheRes = await cacheMatch(req, {ifNoneMatch: true}); // ifNoneMatch: 'if-none-match' header from cached response ETag
const res = await fetch(req);
if (res.status === 304) { // 304 Not Modified
  // use cached response
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