[http-cache]: handle cache invalidation of location and content-location headers

[Uzlopak]

this is a follow up to the follow up.

[mcollina]

I think this should be awaited if it's a promise.

[ivan-tymoshenko]

@Uzlopak What do you think about making this method more generic for calling it outside of the undici package. I have two suggestions:

• pass an array of paths instead of one path. This might be useful for another cache store types if user wants to delete mutiple paths. These storages might perform a batch delete operation much faster than deleting it one by one.
• pass also an http method and not only the path. For most cases users would want to cache only GET/HEAD requests, but still someone might want to cache other methods, so it would be nice to have an ability to delete routes from the cache independenty

[ivan-tymoshenko]

I would split the key here by the : because the MemoryCacheStore indeed stores keys in a format path:method, but this might be not true for other types of stores. So if someone will rely on this it might be a breaking change in the future.