Model the HTTParty http client

We currently model direct calls like

    HTTParty.get("http://example.com")

but we don't yet handle calls on other classes that have included the
`HTTParty` module, like

    class MyClient
      include HTTParty
    end
    MyClient.get("http://example.com")

ql/test/library-tests/frameworks/http_clients/HTTParty.expected

@@ -0,0 +1,7 @@
+| HTTParty.rb:5:1:5:35 | call to get | HTTParty.rb:5:1:5:35 | call to get |
+| HTTParty.rb:7:1:7:55 | call to post | HTTParty.rb:7:1:7:55 | call to post |
+| HTTParty.rb:9:1:9:54 | call to put | HTTParty.rb:9:1:9:54 | call to put |
+| HTTParty.rb:11:1:11:56 | call to patch | HTTParty.rb:11:1:11:56 | call to patch |
+| HTTParty.rb:15:9:15:46 | call to delete | HTTParty.rb:16:1:16:10 | call to body |
+| HTTParty.rb:18:9:18:44 | call to head | HTTParty.rb:19:1:19:10 | call to body |
+| HTTParty.rb:21:9:21:47 | call to options | HTTParty.rb:22:1:22:10 | call to body |

ql/test/library-tests/frameworks/http_clients/HTTParty.ql

@@ -0,0 +1,4 @@
+import codeql.ruby.frameworks.http_clients.HTTParty
+import codeql.ruby.DataFlow
+
+query DataFlow::Node httpartyRequests(HTTPartyRequest e) { result = e.getResponseBody() }

ql/test/library-tests/frameworks/http_clients/HTTParty.rb

@@ -0,0 +1,31 @@
+require "httparty"
+
+# If the response body is not nil or an empty string, it will be parsed and returned directly.
+
+HTTParty.get("http://example.com/")
+
+HTTParty.post("http://example.com/", body: "some_data")
+
+HTTParty.put("http://example.com/", body: "some_data")
+
+HTTParty.patch("http://example.com/", body: "some_data")
+
+# Otherwise, `HTTParty::Response` will be returned, which has a `#body` method.
+
+resp5 = HTTParty.delete("http://example.com/")
+resp5.body
+
+resp6 = HTTParty.head("http://example.com/")
+resp6.body
+
+resp7 = HTTParty.options("http://example.com/")
+resp7.body
+
+# HTTParty methods can also be included in other classes.
+# This is not yet modelled.
+
+class MyClient
+  inlcude HTTParty
+end
+
+MyClient.get("http://example.com")