Update generate pipeline to add OpenAI api as an additional backend (for comparison testing), add brewery coordinates (#244)

* add brewery coordinates

* Add openai mode

* Add coordinates to schema

* Fix C++ review findings in pipeline: k-prefixed enum values, include ordering, populated validation error messages, conventional const notation, and endl replaced with newline

tooling/pipeline/includes/web_client/http_web_client.h

@@ -9,6 +9,7 @@
 #include <memory>
 #include <string>
 #include <utility>
+#include <vector>
 
 #include "services/logging/logger.h"
 #include "web_client/web_client.h"
@@ -39,6 +40,22 @@ class HttpWebClient final : public WebClient {
     */
    std::string Get(const std::string& url) override;
 
+   /**
+    * @brief Executes a blocking HTTP/HTTPS POST request against a full URL.
+    *
+    * Sends @p body with a "Content-Type: application/json" header, plus any
+    * additional headers supplied by the caller (e.g. authentication).
+    *
+    * @param url Fully-qualified URL.
+    * @param body Request body, sent as-is.
+    * @param headers Additional request headers.
+    * @return Response body on HTTP 2xx; throws std::runtime_error otherwise.
+    */
+   std::string Post(
+       const std::string& url, const std::string& body,
+       const std::vector<std::pair<std::string, std::string>>& headers)
+       override;
+
    /**
     * @brief Percent-encodes a single URI component (query parameter value or
     *        path segment). Delegates to httplib::encode_uri_component().