add stdexec (#3454)

* add stdexec

* add deps

packages/s/stdexec/xmake.lua

@@ -0,0 +1,21 @@
+package("stdexec")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/NVIDIA/stdexec")
+    set_description("`std::execution`, the proposed C++ framework for asynchronous and parallel programming. ")
+
+    add_urls("https://github.com/NVIDIA/stdexec.git")
+
+    add_versions("2024.03.08", "b3ba13a7b8c206371207196e08844fb7bc745438")
+
+    add_deps("cmake")
+
+    on_install("linux", function (package)
+        local configs = {"-DSTDEXEC_BUILD_EXAMPLES=OFF", "-DSTDEXEC_BUILD_TESTS=OFF"}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+      assert(package:has_cxxincludes("exec/static_thread_pool.hpp", {configs = {languages = "c++20"}}))
+  end)