Add a single "response" life-cycle event

[kettanaito]

Having two different events to listen to a single thing—the response end—is cumbersome:

• response:mocked
• response:bypass

Proposal

1. Deprecate the response:mocked and response:bypass events.
2. Instead, add a new response event that allows the user to differentiate between the response type via an argument property.

server.events.on('response', ({ response, responseType }) => {
  if (responseType === 'mock') {}
  if (responseType === 'passthrough') {}
})