[clang-tools-extra] [clang-tidy]Add new check readability-avoid-nested-conditional-operator (PR #78022)

[Piotr Zegar via cfe-commits]

================
@@ -0,0 +1,20 @@
+.. title:: clang-tidy - readability-avoid-nested-conditional-operator
+
+readability-avoid-nested-conditional-operator
+=================================================
+
+Finds nested conditional operator.
----------------
PiotrZSL wrote:

maybe:
`Identifies instances of nested conditional operators in the code.`

https://github.com/llvm/llvm-project/pull/78022