Add INMP441 WAV recorder for CYD 2.8/3.5.

Record 16 kHz mono PCM to microSD /rec, with level meter and DAC2 playback.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/player.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <stdint.h>
+
+void player_init(void);
+bool player_play(const char *path);
+void player_stop(void);
+bool player_is_playing(void);
+const char *player_status(void);
+void player_tick(void); /* stream next chunk to DAC */