feat: add messagequeue api

include/api.h

@@ -0,0 +1,27 @@
+#ifndef SCI_API_H
+#define SCI_API_H
+
+// Start the api. This will also trigger an "sci started" event.
+// Note that this is a blocking call.
+void* api_start(void*);
+
+// Fork the process and have the child run the api.
+void api_start_p();
+
+// Destroy all listeners and release the message queue.
+void api_destroy();
+
+// Post a newline-separated string with pipeline_id entries
+// of the currently running pipelines on the message queue.
+void api_list_running_pipelines();
+
+// Trigger a pipeline started event.
+void api_pipeline_started(const char* pipeline_id, const char* name);
+
+// Trigger a pipeline ended event.
+void api_pipeline_ended(const char* pipeline_id, const char* name, int exit_code);
+
+// Trigger an api started event.
+void api_started();
+
+#endif // !SCI_API_H