[clang-tools-extra] create new clang-tidy check to add namespaces to symbol references (PR #70621)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff a8d0c86174b4e7355e250b3eb266e055df224f48 38df6a99730d64eb96945845b69ce7602ce3ddfa -- clang-tools-extra/clang-tidy/readability/UseExplicitNamespacesCheck.cpp clang-tools-extra/clang-tidy/readability/UseExplicitNamespacesCheck.h clang-tools-extra/test/clang-tidy/checkers/readability/use-explicit-namespaces.cpp clang-tools-extra/clang-tidy/readability/ReadabilityTidyModule.cpp
``````````

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<details>
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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/UseExplicitNamespacesCheck.cpp b/clang-tools-extra/clang-tidy/readability/UseExplicitNamespacesCheck.cpp
index 2143b392a..776c895c8 100644
--- a/clang-tools-extra/clang-tidy/readability/UseExplicitNamespacesCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/UseExplicitNamespacesCheck.cpp
@@ -327,8 +327,8 @@ getDeclContextVector(const DeclContext *context) {
       break;
     case Decl::Namespace:
       namespacesStarted = true;
-      [[fallthrough]] default
-          : if (namespacesStarted && kind != Decl::Namespace) {
+    [[fallthrough]] default:
+      if (namespacesStarted && kind != Decl::Namespace) {
         std::cout << "processing namepsace vector after namespace "
                      "we have "
                   << context->getDeclKindName() << std::endl;

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https://github.com/llvm/llvm-project/pull/70621