ORT-HF Benchmark Integration (#101)

-Add HF Benchmarker class.
-Add sample to benchmark HF model.

Example:
```bash
python -m benchmarks.hf_model_benchmark --num_iterations=10 --model_name="microsoft/MiniLM-L12-H384-uncased"
```

.github/workflows/test-models.yml

@@ -90,5 +90,5 @@ jobs:
     - name: Validate Models
       run: |
         source shark.venv/bin/activate
-        pytest -k 'not benchmark'
+        pytest -k 'not benchmark' --ignore=shark/tests/test_hf_benchmark.py