add --version to llama stack CLI & /version endpoint (#732)

# What does this PR do?

- add --version to llama stack CLI 
- add /version endpoint
- run OpenAPI generator for the new endpoint

## Test Plan

**CLI**
<img width="184" alt="image"
src="https://github.com/user-attachments/assets/3acb1d22-453e-4b79-baf6-e98e88d0671c"
/>



**endpoint**
<img width="430" alt="image"
src="https://github.com/user-attachments/assets/79cdd670-493b-40cf-8f9e-28a4ac0988ac"
/>


## 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/distribution/inspect.py

@@ -4,11 +4,18 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
+from importlib.metadata import version
 from typing import Dict, List
 
 from pydantic import BaseModel
 
-from llama_stack.apis.inspect import HealthInfo, Inspect, ProviderInfo, RouteInfo
+from llama_stack.apis.inspect import (
+    HealthInfo,
+    Inspect,
+    ProviderInfo,
+    RouteInfo,
+    VersionInfo,
+)
 from llama_stack.distribution.datatypes import StackRunConfig
 from llama_stack.distribution.server.endpoints import get_all_api_endpoints
 
@@ -65,3 +72,6 @@ class DistributionInspectImpl(Inspect):
 
     async def health(self) -> HealthInfo:
         return HealthInfo(status="OK")
+
+    async def version(self) -> VersionInfo:
+        return VersionInfo(version=version("llama-stack"))