[clang-tools-extra] [clang-tidy] The first PR our of many PRs for the "Initialized Class Members" check. (PR #65189)

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adriannistor wrote:

@Xazax-hun @carlosgalvezp @EugeneZelenko @PiotrZSL 

I addressed all the comments in this PR. Please take a look and let me know what you think!

@PiotrZSL  @carlosgalvezp , for the [comment regarding the the existing checker](https://github.com/llvm/llvm-project/pull/65189#pullrequestreview-1607880468), I fully discuss this topic in [this newly posted comment](https://github.com/llvm/llvm-project/pull/65189#issuecomment-1709185690). Please take a look and let me know what you think!

Thanks!

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