feat(incremental): do not initiate multiple streams at the same path

[yaacovCR]

This builds upon the defer merging work in #3820.

The following operation:

query { 
  friendList @stream(initialCount: 2) {
    name
    id
  }
  ... @defer {
    friendList @stream(initialCount: 2) {
      name
      id
    }
  }
}

will now only result in a single stream.

Corresponding spec change is at: robrichard/graphql-spec#12

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[yaacovCR]

closing this in favor of #3862