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/plugins/PluginAPI.cpp

@@ -320,7 +320,7 @@ APICALL std::vector<SFunctionMatch> HyprlandAPI::findFunctionsByName(HANDLE hand
     };
 
     if (SYMBOLS.empty()) {
-        Debug::log(ERR, "Unable to search for function \"{}\": no symbols found in binary (is \"{}\" in path?)", name,
+        Debug::log(ERR, R"(Unable to search for function "{}": no symbols found in binary (is "{}" in path?))", name,
 #ifdef __clang__
                    "llvm-nm"
 #else