Automatically cancel in flight requests that use the same query

[weotch]

Axios supports cancelling inflight requests with it's cancel token:

• https://axios-http.com/docs/cancellation
• https://axios.nuxtjs.org/usage#cancel-token

This task is to automatically cancel requests when a new request comes in with the exact same payload. This should improve Craft previews where sometimes there is a race condition when an earlier content update replaces a later one.