HTTPTransportClient doesn't check for HTTP status code

This issue is similar to THRIFT-4641.

When receiving a non 2xx code, HTTPTransportClient tries to parse response body instead of raising a clean TransportError.

We observe a Thrift::ProtocolException instead of a Thrift::TransportException

Example:

• request on http://example.org/test returns an 500 response, with an empty body (or an error page).
• currently ruby code will not read the response code and blindly try to parse the body
• this action will fail with ProtocolException (which is, I believe, the error meaning "protocol is not implemented correctly)

In this case, reading the error code sent by the http layer (500) and raising appropriate exception (TransportException) feels more correct. This bug was already present in THRIFT-4641 (for the php client). Quoting this other ticket:

TCurlClient doesn't check for HTTP status code. Other languages, such as Go and Java
do check for it. This can lead to potentially wrong exception being thrown: TProtocolException
instead of TTransportException. To be more precise, TCurlTransport doesn't error out and
Protocol starts to parse response, which may lead to TProtocolException. For example, AWS
ALB may return 502 Bad Gateway with HTML as part of payload when there's an issue with an
upstream. In such case, a client may want to retry but it only makes sense if there's a transport
exception.