chore: configure proper C++ IntelliSense for VSCode

Author: Xmader

.vscode/c_cpp_properties.json

@@ -0,0 +1,20 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/include/**"
+            ],
+            "defines": [],
+            "compilerPath": "/usr/bin/clang",
+            "cStandard": "c17",
+            "cppStandard": "c++20",
+            "intelliSenseMode": "linux-clang-x64",
+            "browse": {
+                "limitSymbolsToIncludedHeaders": true
+            },
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json"
+        }
+    ],
+    "version": 4
+}

CMakeLists.txt

@@ -11,6 +11,7 @@ project("PythonMonkey"
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 # Add an external; appends to `PYTHONMONKEY_EXTERNAL_FILES` in the parent scope.
 function(pythonmonkey_add_external PYTHONMONKEY_EXTERNAL)