Some refactoring to prep for BLE support.

src/endpoints.c

@@ -0,0 +1,17 @@
+
+#include "endpoints.h"
+#include "usb_hid.h"
+
+int zmk_endpoints_send_key_event(struct zmk_key_event key_event)
+{
+    if (key_event.pressed)
+    {
+        zmk_usb_hid_press_key(key_event.key);
+    }
+    else
+    {
+        zmk_usb_hid_release_key(key_event.key);
+    }
+
+    return 0;
+}