Fix: apply cache name when sending events

[cejast]

• Passing in a cache with name field is no longer supported for sending stats
• Instead, name is part of the options passed into the middleware, e.g.

httpTransport.use(httpTransportCache.maxAge(cache, { name: 'somecache' });

• This also fixes sending hit/miss stats events alongside staleIfError events

[nspragg]

👍