core: Add clang-tidy (#8664)

This adds a .clang-tidy file for us.

It's not a strict requirement to be compliant, but I tuned it to be alright.

src/config/ConfigValue.hpp

@@ -13,6 +13,7 @@ class CConfigValue {
     CConfigValue(const std::string& val) {
         const auto PVHYPRLANG = g_pConfigManager->getHyprlangConfigValuePtr(val);
 
+        // NOLINTNEXTLINE
         p_ = PVHYPRLANG->getDataStaticPtr();
 
 #ifdef HYPRLAND_DEBUG