Include what you use in http request and response

https://jenkins.openbmc.org/job/ci-openbmc/3949/distro=ubuntu,label=docker-builder,target=tiogapass/consoleText

This build seems to be failing with an error |
../git/http/http_response.hpp:23:10: error: 'optional' in namespace
'std' does not name a template type |    23 |
std::optional<response_type> stringResponse;

This should fix it by including the relevant headers.

Tested:
Code builds. CI error only.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ifba15559a73d823d791de1d508e136a3c44e6cd1
diff --git a/http/http_response.hpp b/http/http_response.hpp
index 7965704..72ff9e9 100644
--- a/http/http_response.hpp
+++ b/http/http_response.hpp
@@ -5,7 +5,9 @@
 #include <boost/beast/http/message.hpp>
 #include <boost/beast/http/string_body.hpp>
 
+#include <optional>
 #include <string>
+#include <string_view>
 
 namespace crow
 {