[clang-tools-extra] Adding an initial version of the "Initialized Class Members" checker. (PR #65189)

[via cfe-commits]

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+.. title:: clang-tidy - google-cpp-init-class-members
+
+google-cpp-init-class-members
+=============================
+
+Checks that class members are initialized in constructors (implicitly or
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EugeneZelenko wrote:

Please synchronize first statement with Release Notes.

https://github.com/llvm/llvm-project/pull/65189