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/apis/inspect/inspect.py

@@ -29,6 +29,11 @@ class HealthInfo(BaseModel):
     # TODO: add a provider level status
 
 
+@json_schema_type
+class VersionInfo(BaseModel):
+    version: str
+
+
 @runtime_checkable
 class Inspect(Protocol):
     @webmethod(route="/providers/list", method="GET")
@@ -39,3 +44,6 @@ class Inspect(Protocol):
 
     @webmethod(route="/health", method="GET")
     async def health(self) -> HealthInfo: ...
+
+    @webmethod(route="/version", method="GET")
+    async def version(self) -> VersionInfo: ...