Refactor HTTP operations (API Change):

* Revise stream algorithm javadocs

* HTTP stream algorithms now use beast::read and
  beast::async_read with a custom completion condition.

API Changes:

* HTTP stream algorithms return the number of bytes transferred
  from the stream. Previously, they returned the number of bytes
  consumed by the parser.

Actions Required:

* Callers depending on the return value of http::read or
  http::async_read overloads should adjust the usage of
  the returned value as needed.

test/beast/http/read.cpp

@@ -23,6 +23,7 @@
 #include <boost/beast/test/yield_to.hpp>
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/strand.hpp>
+#include <boost/asio/ip/tcp.hpp>
 #include <atomic>
 
 namespace boost {