new header and glue code for C api

consumer/api/c/include/asapo/consumer_c.h

+#ifndef __CONSUMER_C_H__
+#define __CONSUMER_C_H__
+
+#ifndef __CONSUMER_C_INTERFACE_IMPLEMENTATION__
+typedef void* asapoConsumer;
+typedef void* asapoSourceCredentials;
+typedef void* asapoError;
+struct asapoErrorBuffer {
+  asapoError error;
+};
+typedef void* asapoMessageMeta;
+typedef void* asapoMessageData;
+
+#endif
+
+asapoConsumer asapoCreateConsumer(const char* server_name,
+				  const char* source_path,
+				  _Bool has_filesysytem,
+				  asapoSourceCredentials source,
+				  asapoErrorBuffer* error);
+asapoMessageMeta asapoCreateMessageMeta();
+void asapoDeleteMessageMeta(asapoMessageMeta* meta);
+
+#endif

consumer/api/c/src/consumer_c_glue.cpp

+#define __CONSUMER_C_INTERFACE_IMPLEMENTATION__
+#include <consumer.h>
+typedef asapo::Consumer* asapoConsumer;
+#include "consumer_c.h"
+
+
+extern c {
+asapoConsumer asapoCreateConsumer(const char* server_name,
+				  const char* source_path,
+				  _Bool has_filesysytem,
+				  asapoSourceCredentials source,
+				  asapoErrorBuffer* error) {
+  auto c = asapo::ConsumerFactory::CreateConsumer(server_name,
+						  source_path,
+						  has_filesysytem,
+						  source_path,
+						  &(error->error));
+  
+  return c.release():
+}