[Voyageurs] Add a basic ps/2 keyboard driver.

sys/voyageurs/voyageurs_server.cpp

@@ -0,0 +1,19 @@
+#include "voyageurs_server.h"
+
+glcr::ErrorOr<glcr::UniquePtr<VoyageursServer>> VoyageursServer::Create(
+    KeyboardDriver& keyboard_driver) {
+  z_cap_t cap;
+  RET_ERR(ZEndpointCreate(&cap));
+  return glcr::UniquePtr<VoyageursServer>(
+      new VoyageursServer(cap, keyboard_driver));
+}
+
+glcr::ErrorCode VoyageursServer::HandleRegisterKeyboardListener(
+    const KeyboardListener& listener, None&) {
+  keyboard_driver_.RegisterListener(listener.port_capability());
+  return glcr::OK;
+}
+
+VoyageursServer::VoyageursServer(z_cap_t voyageurs_cap,
+                                 KeyboardDriver& keyboard_driver)
+    : VoyageursServerBase(voyageurs_cap), keyboard_driver_(keyboard_driver) {}