Add an internal `config.aciResolved` when the adapter is changed to resolve to a cached response.

[Arthur Fiorette]

When creating custom request interceptors, we could provide a internal aciResolved property on config to warn them that the response was intercepted and its config adapter is just a Promise.resolve().

This is useful for implementations like a rate limiter, because we should not rate limit cached requests.

Line where the property should be added:

axios-cache-interceptor/src/interceptors/request.ts

Line 213 in 4f88736

 config.adapter = (): Promise<CacheAxiosResponse> => 

Also, a test and documentation should be added/changed where needed (I can help with this) .

[Arthur Fiorette]

This was only a common hallucination between me and a friend. response.cached === true already does that.