feat: add keyboard layout support

programs/include/libc/montauk.h

@@ -233,6 +233,9 @@ typedef struct {
     uint8_t shift;
     uint8_t ctrl;
     uint8_t alt;
+    uint8_t capslock;
+    uint8_t altgr;
+    uint8_t extended;
 } mtk_key_event;
 
 typedef struct {