[libc] Complete hardening of time functions and remove Y2038 limit (#203298) Completed safety and hardening refactoring for time functions, and removed Y2038 limitation: * Hardening: Refactored update_from_seconds to return ErrorOr<int> (instead of int64_t status, as it only returns status 0 or error) and propagated it to entrypoints. Added LIBC_CRASH_ON_NULLPTR to public boundaries and converted tests to death tests using SIGILL. * Y2038: Removed the artificial int32_t max check from ctime and ctime_r, allowing them to support timestamps beyond 2038 (up to Year 9999). * Tests: Updated ctime/ctime_r tests to include Year 2039 test cases and updated overflow test cases to Year 10000. * Style: Fixed header blocks and added Doxygen comments in converter.h, str_converter.h, and time_utils.h. * Conventions: Fixed relative includes in converter.h and time_utils.h. Assisted-by: Automated tooling, human reviewed.
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