The layering_check feature ensures that rules that include a header
explicitly depend on a rule that exports that header. Compiler support
is required, and currently only Clang 16+ supports diagnoses
layering_check failures.

The parse_headers feature ensures headers are self-contained by
compiling them with -fsyntax-only on supported compilers.

PiperOrigin-RevId: 572350144
Change-Id: I37297f761566d686d9dd58d318979d688b7e36d1