Add cpp-async package (#4323)

* cpp-async: add package

* Update xmake.lua

* add check

---------

Co-authored-by: star9029 <hengxings783@gmail.com>

packages/c/cpp-async/xmake.lua

@@ -0,0 +1,29 @@
+package("cpp-async")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/microsoft/cpp-async")
+    set_description("Support types and functions for C++20 coroutines")
+    set_license("MIT")
+
+    add_urls("https://github.com/microsoft/cpp-async/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/microsoft/cpp-async.git")
+
+    add_versions("v1.1.0", "168681dfd999b7546d623f20d18072ce280502cf0bf3a829c2aec58741062a23")
+
+    on_check(function (package)
+        assert(package:has_cxxincludes("coroutine", {configs = {languages = "c++20"}}), "package(cpp-async) Require at least C++20.")
+    end)
+
+    on_install(function (package)
+        os.cp("include/async", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <async/task.h>
+            #include <coroutine>
+            inline async::task<void> do_async()
+            {
+                co_return;
+            }
+        ]]}, {configs = {languages = "c++20"}}))
+    end)