very, very simple WP with midi CC out

include/libremidi/backends/alsa_raw_ump/config.hpp

@@ -0,0 +1,24 @@
+#pragma once
+#include <libremidi/backends/alsa_raw/config.hpp>
+
+namespace libremidi::alsa_raw_ump
+{
+struct input_configuration
+{
+  std::function<bool(const manual_poll_parameters&)> manual_poll;
+};
+
+struct output_configuration
+{
+  /**
+   * For large messages, chunk their content and wait.
+   * Setting a null optional will disable chunking.
+   */
+  std::optional<chunking_parameters> chunking;
+};
+
+struct observer_configuration
+{
+  std::chrono::milliseconds poll_period{100};
+};
+}