[clang-tools-extra] [clang-tidy] Move part of bugprone-unhandled-code-paths to a new check readability-trivial-switch (PR #198237)

[via cfe-commits]

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+.. title:: clang-tidy - readability-trivial-switch
+
+readability-trivial-switch
+==========================
+
+Finds trivial ``switch`` statements that can be written more clearly.
+
+Every ``switch`` statement should have at least two ``case`` labels other than a ``default`` label.
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EugeneZelenko wrote:

Format.

https://github.com/llvm/llvm-project/pull/198237