Add a way to record isolated operations

[wschurman]

While debugging, it would be useful to be able to get information about entity loads/mutations/etc to see things like:

• If it hit the DB, what was the query run
• If it hit or wrote to the cache, what were the cache keys used
• If it only went to the dataloader, indicate as such
• etc...

An API for this could look something like:

const [queryContextAuditResult, entityResultFromInnerBlock] = await withIsolatedQueryContext(async (queryContext) => {
  return await BlahEntity.loader(viewerContext, queryContext).load(...);
});
console.log(queryContextAuditResult);

[wschurman]

Expanding upon this further, would be nice to have general debug mode, kinda like knex's debug maybe: https://knexjs.org/faq/#how-do-i-debug