Allow dumping all options in a configuration

src/topic_configuration.cpp

@@ -35,6 +35,7 @@
 #include "buffer.h"
 
 using std::string;
+using std::map;
 using std::vector;
 
 namespace cppkafka {
@@ -106,6 +107,14 @@ string TopicConfiguration::get(const string& name) const {
     return string(buffer.data());
 }
 
+map<string, string> TopicConfiguration::get_all() const {
+    size_t count = 0;
+    const char** all = rd_kafka_topic_conf_dump(handle_.get(), &count);
+    map<string, string> output = parse_dump(all, count);
+    rd_kafka_conf_dump_free(all, count);
+    return output;
+}
+
 rd_kafka_topic_conf_t* TopicConfiguration::get_handle() const {
     return handle_.get();
 }