[clang-tools-extra] Add check 'modernize-use-enum-class' (PR #138282)

[Baranov Victor via cfe-commits]

================
@@ -115,6 +115,11 @@ New checks
   Gives warnings for tagged unions, where the number of tags is
   different from the number of data members inside the union.
 
+- New :doc:`modernize-use-enum-class
+  <clang-tidy/checks/modernize/use-enum-class>` check.
+
+  Finds plain non-class enum definitions that could use ``enum class``.
----------------
vbvictor wrote:

```suggestion
  Finds plain non-class `enum` definitions that could use ``enum class``.
```

https://github.com/llvm/llvm-project/pull/138282