[clang] [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
+pointer rather than the pointer itself (ie `std::move(*p)` rather than
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EugeneZelenko wrote:

`i.e.`?

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