[clang-tools-extra] Enforce SL.con.3: Add check to replace operator[] with at() [Cont.] (PR #95220)

[Paul Heidekrüger via cfe-commits]

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+.. title:: clang-tidy - cppcoreguidelines-prefer-at-over-subscript-operator
+
+cppcoreguidelines-prefer-at-over-subscript-operator
+=====================================
+
+This check flags all uses of ``operator[]`` where an equivalent (same parameter and return types) ``at()`` method exists and suggest using that instead.
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PBHDK wrote:

Which of the two statements do you prefer: this one or the one in the release notes?

> Please synchronize with statement in Release Notes.

Which of the two statements do you prefer: this one or the one in the release notes?

https://github.com/llvm/llvm-project/pull/95220