[tests] add client-sdk pytests & delete client.py (#638)

# What does this PR do?

**Why**
- Clean up examples which we will not maintain; reduce the surface area
to the minimal showcases

**What**
- Delete `client.py` in /apis/*
- Move all scripts to unit tests
  - SDK sync in the future will just require running pytests

**Side notes**
- `bwrap` not available on Mac so code_interpreter will not work

## Test Plan

```
LLAMA_STACK_BASE_URL=http://localhost:5000 pytest -v ./tests/client-sdk
```
<img width="725" alt="image"
src="https://github.com/user-attachments/assets/36bfe537-628d-43c3-8479-dcfcfe2e4035"
/>


## 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.

llama_stack/apis/datasets/client.py

@@ -1,131 +0,0 @@
-# Copyright (c) Meta Platforms, Inc. and affiliates.
-# All rights reserved.
-#
-# This source code is licensed under the terms described in the LICENSE file in
-# the root directory of this source tree.
-
-import asyncio
-import json
-import os
-from pathlib import Path
-from typing import Optional
-
-import fire
-import httpx
-from termcolor import cprint
-
-from .datasets import *  # noqa: F403
-from llama_stack.apis.datasets import *  # noqa: F403
-from llama_stack.apis.common.type_system import *  # noqa: F403
-from llama_stack.providers.tests.datasetio.test_datasetio import data_url_from_file
-
-
-class DatasetsClient(Datasets):
-    def __init__(self, base_url: str):
-        self.base_url = base_url
-
-    async def initialize(self) -> None:
-        pass
-
-    async def shutdown(self) -> None:
-        pass
-
-    async def register_dataset(
-        self,
-        dataset_def: DatasetDefWithProvider,
-    ) -> None:
-        async with httpx.AsyncClient() as client:
-            response = await client.post(
-                f"{self.base_url}/datasets/register",
-                json={
-                    "dataset_def": json.loads(dataset_def.json()),
-                },
-                headers={"Content-Type": "application/json"},
-                timeout=60,
-            )
-            response.raise_for_status()
-            return
-
-    async def get_dataset(
-        self,
-        dataset_identifier: str,
-    ) -> Optional[DatasetDefWithProvider]:
-        async with httpx.AsyncClient() as client:
-            response = await client.get(
-                f"{self.base_url}/datasets/get",
-                params={
-                    "dataset_identifier": dataset_identifier,
-                },
-                headers={"Content-Type": "application/json"},
-                timeout=60,
-            )
-            response.raise_for_status()
-            if not response.json():
-                return
-
-            return DatasetDefWithProvider(**response.json())
-
-    async def list_datasets(self) -> List[DatasetDefWithProvider]:
-        async with httpx.AsyncClient() as client:
-            response = await client.get(
-                f"{self.base_url}/datasets/list",
-                headers={"Content-Type": "application/json"},
-                timeout=60,
-            )
-            response.raise_for_status()
-            if not response.json():
-                return
-
-            return [DatasetDefWithProvider(**x) for x in response.json()]
-
-    async def unregister_dataset(
-        self,
-        dataset_id: str,
-    ) -> None:
-        async with httpx.AsyncClient() as client:
-            response = await client.delete(
-                f"{self.base_url}/datasets/unregister",
-                params={
-                    "dataset_id": dataset_id,
-                },
-                headers={"Content-Type": "application/json"},
-                timeout=60,
-            )
-            response.raise_for_status()
-
-
-async def run_main(host: str, port: int):
-    client = DatasetsClient(f"http://{host}:{port}")
-
-    # register dataset
-    test_file = (
-        Path(os.path.abspath(__file__)).parent.parent.parent
-        / "providers/tests/datasetio/test_dataset.csv"
-    )
-    test_url = data_url_from_file(str(test_file))
-    response = await client.register_dataset(
-        DatasetDefWithProvider(
-            identifier="test-dataset",
-            provider_id="meta0",
-            url=URL(
-                uri=test_url,
-            ),
-            dataset_schema={
-                "generated_answer": StringType(),
-                "expected_answer": StringType(),
-                "input_query": StringType(),
-            },
-        )
-    )
-
-    # list datasets
-    list_dataset = await client.list_datasets()
-    cprint(list_dataset, "blue")
-
-
-def main(host: str, port: int):
-    asyncio.run(run_main(host, port))
-
-
-if __name__ == "__main__":
-    fire.Fire(main)