Add HTTP Proxy configuration pattern

• User impact:

  Low
• Affects Docs:

  Yes
• Similar Issues:

  None

Ross: "This is similar to WS Proxy but without the WSDL but has a caching component to it. Basically I see
users needing to proxy GET and POST requests, making sure query params and headers are propagated correctly. Additionally for GET request they want to put a cache in between to reduce reads on the back end server."

The HTTP Proxy will support only request-response pattern. If a store-and-forward behavior is needed, the idea is to use the upcoming dedicated pattern as a frontal to the HTTP Proxy.