add pytest option to generate a functional report for distribution (#833)

# What does this PR do?

add pytest option (`--report`) to support generating a functional report
for llama stack distribution

## Test Plan
```
export LLAMA_STACK_CONFIG=./llama_stack/templates/fireworks/run.yaml
/opt/miniconda3/envs/stack/bin/pytest -s -v tests/client-sdk/  --report
```

See a report file was generated under
`./llama_stack/templates/fireworks/report.md`


## Sources

Please link relevant resources if necessary.


## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [ ] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

tests/client-sdk/conftest.py

@@ -10,11 +10,27 @@ import pytest
 from llama_stack import LlamaStackAsLibraryClient
 from llama_stack.providers.tests.env import get_env_or_fail
 from llama_stack_client import LlamaStackClient
+from report import Report
 
 
 def pytest_configure(config):
     config.option.tbstyle = "short"
     config.option.disable_warnings = True
+    if config.getoption("--report"):
+        config.pluginmanager.register(Report())
+
+
+def pytest_addoption(parser):
+    parser.addoption(
+        "--report",
+        default=False,
+        action="store_true",
+        help="Knob to determine if we should generate report, e.g. --output=True",
+    )
+
+
+TEXT_MODEL = "meta-llama/Llama-3.1-8B-Instruct"
+INFERENCE_MODEL = "meta-llama/Llama-3.2-11B-Vision-Instruct"
 
 
 @pytest.fixture(scope="session")