[llama stack ui] add native eval & inspect distro & playground pages (#541)

# What does this PR do?

New Pages Added: 

- (1) Inspect Distro
- (2) Evaluations: 
  - (a) native evaluations (including generation)
  - (b) application evaluations (no generation, scoring only)
- (3) Playground: 
  - (a) chat
  - (b) RAG  

## Test Plan

```
streamlit run app.py
```

#### Playground

https://github.com/user-attachments/assets/6ca617e8-32ca-49b2-9774-185020ff5204

#### Inspect

https://github.com/user-attachments/assets/01d52b2d-92af-4e3a-b623-a9b8ba22ba99


#### Evaluations (Generation + Scoring)

https://github.com/user-attachments/assets/345845c7-2a2b-4095-960a-9ae40f6a93cf

#### Evaluations (Scoring)

https://github.com/user-attachments/assets/6cc1659f-eba4-49ca-a0a5-7c243557b4f5


## 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/distribution/ui/page/distribution/resources.py

@@ -0,0 +1,52 @@
+# 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.
+
+from page.distribution.datasets import datasets
+from page.distribution.eval_tasks import eval_tasks
+from page.distribution.memory_banks import memory_banks
+from page.distribution.models import models
+from page.distribution.scoring_functions import scoring_functions
+from page.distribution.shields import shields
+
+from streamlit_option_menu import option_menu
+
+
+def resources_page():
+    options = [
+        "Models",
+        "Memory Banks",
+        "Shields",
+        "Scoring Functions",
+        "Datasets",
+        "Eval Tasks",
+    ]
+    icons = ["magic", "memory", "shield", "file-bar-graph", "database", "list-task"]
+    selected_resource = option_menu(
+        None,
+        options,
+        icons=icons,
+        orientation="horizontal",
+        styles={
+            "nav-link": {
+                "font-size": "12px",
+            },
+        },
+    )
+    if selected_resource == "Eval Tasks":
+        eval_tasks()
+    elif selected_resource == "Memory Banks":
+        memory_banks()
+    elif selected_resource == "Datasets":
+        datasets()
+    elif selected_resource == "Models":
+        models()
+    elif selected_resource == "Scoring Functions":
+        scoring_functions()
+    elif selected_resource == "Shields":
+        shields()
+
+
+resources_page()