Add clang-tidy script that runs on all files in parallel

Extra options are forwarded to clang-tidy

For example: ./tools/check-clang-tidy.sh --checks '-*,readability-braces-around-statements' --fix

tools/check-clang-tidy.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -eu
+
+clang-tidy --version
+
+find src/ -type f \( -name "*.hpp" -o -name "*.cpp" \) -print0 | parallel -0 -I {} clang-tidy --quiet "$@" "{}"