实现pty，附带测试程序 (#685)

* 实现pty，附带测试程序

* fmt ** clippy

* 将file层的锁粒度缩小，从而不使用no_preempt。更改pipe在sleep部分的bug

* 修复拼写错误

user/dadk/config/test_pty-0.1.0.dadk

@@ -0,0 +1,23 @@
+{
+  "name": "test_pty",
+  "version": "0.1.0",
+  "description": "简单的pty测试程序",
+  "task_type": {
+    "BuildFromSource": {
+      "Local": {
+        "path": "apps/test_pty"
+      }
+    }
+  },
+  "depends": [],
+  "build": {
+    "build_command": "make install -j $(nproc)"
+  },
+  "install": {
+    "in_dragonos_path": "/bin"
+  },
+  "clean": {
+    "clean_command": "make clean"
+  },
+  "envs": []
+}