[clang-tools-extra] [clang-tidy] Add check 'bugprone-invalid-enum-default-initialization' (PR #136823)

[Piotr Zegar via cfe-commits]

================
@@ -0,0 +1,116 @@
+// RUN: %check_clang_tidy -std=c++17 %s bugprone-invalid-enum-default-initialization %t
+
----------------
PiotrZSL wrote:

Add test with enum forward declaration only, and with enum without enumerators.
For those there should be no requirement in initialization.

https://github.com/llvm/llvm-project/pull/136823