[clang-tools-extra] Add ability to pass in a clang-tidy config file to clang-tidy-diff (PR #75721)

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``````````bash
darker --check --diff -r 0ca95b269ff90afb706e2cf4c4a59d7c3afe6c65...433f4ac919a6967c278e56a19b5824e474ebd907 clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py
``````````

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View the diff from darker here.
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``````````diff
--- clang-tidy-diff.py	2023-12-16 23:53:56.000000 +0000
+++ clang-tidy-diff.py	2023-12-16 23:58:40.770370 +0000
@@ -225,11 +225,11 @@
     )
     parser.add_argument(
         "-config",
         dest="config",
         default=None,
-        help="Specifies a clang-tidy config file"
+        help="Specifies a clang-tidy config file",
     )
 
     clang_tidy_args = []
     argv = sys.argv[1:]
     if "--" in argv:

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https://github.com/llvm/llvm-project/pull/75721