test(semaphore): add comprehensive unit tests for ipc::sync::semaphore

- Test semaphore construction (default and named with count)
- Test wait and post operations
- Test timed wait with various timeout values
- Test producer-consumer patterns
- Test multiple producers and consumers scenarios
- Test concurrent post operations
- Test initial count behavior
- Test named semaphore sharing between threads
- Test resource cleanup (clear, clear_storage)
- Test edge cases (zero timeout, after clear, high frequency)

Author: mutouyun