[clang-tools-extra] [clang-tidy][bugprone-unintended-char-ostream-output] add `WarnOnExplicitCast` option (PR #133639)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

I believe it would be good to wait before the discussion settled in the issue ticket. Personally I think this should be solved with a `NOLINT` suppression instead of adding a new feature which just adds confusion.

https://github.com/llvm/llvm-project/pull/133639