[clang-tools-extra] [clang-tidy] Add new check readability-trailing-comma (PR #173669)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp,h -- clang-tools-extra/clang-tidy/readability/TrailingCommaCheck.cpp clang-tools-extra/clang-tidy/readability/TrailingCommaCheck.h clang-tools-extra/test/clang-tidy/checkers/readability/trailing-comma-cxx20-remove.cpp clang-tools-extra/test/clang-tidy/checkers/readability/trailing-comma-cxx20.cpp clang-tools-extra/test/clang-tidy/checkers/readability/trailing-comma-remove.cpp clang-tools-extra/test/clang-tidy/checkers/readability/trailing-comma.c clang-tools-extra/test/clang-tidy/checkers/readability/trailing-comma.cpp clang-tools-extra/clang-tidy/readability/ReadabilityTidyModule.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clang-tidy/readability/TrailingCommaCheck.cpp b/clang-tools-extra/clang-tidy/readability/TrailingCommaCheck.cpp
index b8b6480f0..efd8e5d5b 100644
--- a/clang-tools-extra/clang-tidy/readability/TrailingCommaCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/TrailingCommaCheck.cpp
@@ -89,7 +89,7 @@ void TrailingCommaCheck::check(const MatchFinder::MatchResult &Result) {
 void TrailingCommaCheck::checkEnumDecl(const EnumDecl *Enum,
                                        const MatchFinder::MatchResult &Result) {
   if (!isMultipleLines(Enum->getBeginLoc(), Enum->getEndLoc(),
-                      *Result.SourceManager))
+                       *Result.SourceManager))
     return;
 
   const EnumConstantDecl *LastEnumerator = nullptr;
@@ -116,7 +116,7 @@ void TrailingCommaCheck::checkInitListExpr(
     if (const InitListExpr *SyntacticForm = InitList->getSyntacticForm())
       InitList = SyntacticForm;
   if (!isMultipleLines(InitList->getBeginLoc(), InitList->getEndLoc(),
-                      *Result.SourceManager))
+                       *Result.SourceManager))
     return;
 
   const unsigned NumInits = InitList->getNumInits();

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https://github.com/llvm/llvm-project/pull/173669