add support for VNG in API responses and load requests #4345
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Send a VNG response for an API request whose negotiated content type is application/x-vng.
When loading data via POST /pool/{pool}/branch/{branch}, if the request content type is application/x-vng, copy the request body to a temporary file for the benefit of the VNG reader, which needs a reader that implements io.ReaderAt and io.Seeker.
Closes #4251.