[clang-tools-extra] [clang-tidy] Rename `google-readability-casting` to `modernize-avoid-c-style-cast` (PR #171058)

[Baranov Victor via cfe-commits]

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+.. title:: clang-tidy - modernize-avoid-c-style-cast
+
+modernize-avoid-c-style-cast
+============================
+
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vbvictor wrote:

```suggestion

Finds usages of C-style casts.
```
Forgot the initial line

https://github.com/llvm/llvm-project/pull/171058