Add CI build for "import std" on MSVC

Author: rollbear

.github/workflows/ci.yml

@@ -147,7 +147,11 @@ jobs:
           - { std: 14 }
           - { std: 17 }
           - { std: 20 }
-    name: "Windows C++${{matrix.config.std}}"
+          - { std: 20, import_std: "import std" }
+          - { std: 23 }
+          - { std: 23, import_std: "import std" }
+
+    name: "Windows C++${{matrix.config.std}} ${{matrix.config.import_std}}"
     steps:
       - uses: actions/checkout@v4
 
@@ -167,6 +171,7 @@ jobs:
             -DCMAKE_BUILD_TYPE=Debug \
             -DCMAKE_VERBOSE_MAKEFILE=yes \
             -DSTRONG_TYPE_UNIT_TEST=yes \
+              ${"${{matrix.config.import_std}}":+"-DSTRONG_TYPE_IMPORT_STD_LIBRARY"} \
             -G Ninja
 
       - name: "build"