Add header only package `matchit` (#4441)

* [add] headeronly package matchit

* [fmt] format matchit/xmake.lua; adopt 4 spaces indentation

* [fix]: the followings:

- fix incorrect sha256 of v1.0.1
- fix failure due to try to download trunk version through release

* [fmt] reformat matchit/xmake.lua

* [fix]: address reviewer's suggestions

- remove trunk version
- install through cmake

* Update xmake.lua

---------

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

packages/m/matchit/xmake.lua

@@ -0,0 +1,31 @@
+package("matchit")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://bowenfu.github.io/matchit.cpp/")
+    set_description("A lightweight single-header pattern-matching library for C++17 with macro-free APIs.")
+    set_license("Apache-2.0")
+
+    add_urls("https://github.com/BowenFu/matchit.cpp/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/BowenFu/matchit.cpp.git")
+
+    add_versions("v1.0.1", "2860cb85febf37220f75cef5b499148bafc9f5541fe1298e11b0c169bb3f31ac")
+
+    add_deps("cmake")
+
+    on_install(function (package)
+        import("package.tools.cmake").install(package, {"-DBUILD_TESTING=OFF"})
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            constexpr int32_t gcd(int32_t a, int32_t b) {
+                using namespace matchit;
+                return match(a, b)(
+                    pattern | ds(_, 0) = [&] { return a >= 0 ? a : -a; },
+                    pattern | _        = [&] { return gcd(b, a%b); }
+                );
+            }
+            void test() {
+                static_assert(gcd(12, 6) == 6);
+            }
+        ]]}, {configs = {languages = "c++17"}, includes = "matchit.h"}))
+    end)