[clang-tools-extra] [clang-tidy] Add performance-move-smart-pointer-contents check. (PR #66139)

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+.. title:: clang-tidy - performance-move-smart-pointer-contents
+
+performance-move-smart-pointer-contents
+=======================================
+
+Given a smart pointer containing a movable type, such as a
+`std::unique_ptr<SomeProtocolBuffer>`, it's possible to move the contents of the
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EugeneZelenko wrote:

Please use double back-ticks for language constructs. Same in other places.

https://github.com/llvm/llvm-project/pull/66139