[clang-tools-extra] Enforce SL.con.3: Add check to replace operator[] with at() (PR #90043)

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+.. title:: clang-tidy - cppcoreguidelines-avoid-bounds-errors
+
+cppcoreguidelines-avoid-bounds-errors
+=====================================
+
+This check enforces the `SL.con.3 <https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#slcon3-avoid-bounds-errors>` guideline.
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EugeneZelenko wrote:

This usually placed at the end of documentation.

https://github.com/llvm/llvm-project/pull/90043