Revisiting Method Negotiation

In the process of investigating the use of QUERY for incremental transfer
I've come to the conclusion that we may need to revisit how we do method
negotiation. I've written up my thoughts in a document here
<https://docs.google.com/document/d/1IcPg4o5k4OOmfLCfa1z2wQl6MD-kPBrahtcb4r-97ZU/edit?usp=sharing&resourcekey=0-9WtXKj_y4uihiB7K740xMQ>
.

The high level summary is that I think:

   - We should split tech(incremental) into tech(incremental-range) and
   tech(incremental-patch).
   - Instead of GET + url parameter use GET + custom header.
   - Add the use of QUERY as optional for the client.

See the document for a much more detailed discussion.

This would be good to discuss at our next call and/or at TPAC in person. In
particular it would be great to have Myle's as the owner of range request
weigh in on this proposal.