[clang-tools-extra] [clang-tidy] Add type annotations to add_new_check.py, fix minor bug (PR #106801)

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darker --check --diff -r 2f4232db0b72635b89c2356c8a2c0504b075a0ab...3945829650ac41f587c161cd6fb505225efba379 clang-tools-extra/clang-tidy/add_new_check.py
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``````````diff
--- add_new_check.py	2024-08-31 17:40:17.000000 +0000
+++ add_new_check.py	2024-08-31 17:44:12.662214 +0000
@@ -13,10 +13,11 @@
 import itertools
 import os
 import re
 import sys
 import textwrap
+
 # FIXME Python 3.9: Replace typing.Tuple with builtins.tuple.
 from typing import Optional, Tuple
 
 
 # Adapts the module's CMakelist file. Returns 'True' if it could add a new

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https://github.com/llvm/llvm-project/pull/106801