HTTP-177 Add HTTP 2 support #178
                
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Description
This PR adds HTTP 2 support. The http client has been change to use HTTP_2 rather than HTTP_1.1. If the implmentaiton does not support http 2 is will revert to http 1.1 as before.
WireMock does not support http2 so I could not add unit tests for it. I have manually tested that HTTP 1.1 servers and http 2 server both work.
Resolves
HTTP177PR Checklist