formatter: add tree-sitter dependency and commit early draft work on a proper code formatter (#2536)

common/util/string_util.cpp

@@ -93,4 +93,12 @@ std::vector<std::string> regex_get_capture_groups(const std::string& str,
   }
   return groups;
 }
+
+bool replace(std::string& str, const std::string& from, const std::string& to) {
+  size_t start_pos = str.find(from);
+  if (start_pos == std::string::npos)
+    return false;
+  str.replace(start_pos, from.length(), to);
+  return true;
+}
 }  // namespace str_util