Add run win command for stack (#890)

# What does this PR do?

Add win platform run command for stack

- [x] Addresses issue (#issue)


## Test Plan

Please describe:
 - tests you ran to verify your changes with result summaries.
 - provide instructions so it can be reproduced.


## Sources

Please link relevant resources if necessary.
https://github.com/meta-llama/llama-stack/pull/889


## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [x] Ran pre-commit to handle lint / formatting issues.
- [x] 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/cli/stack/run.py

@@ -6,6 +6,7 @@
 
 import argparse
 import os
+import sys
 from pathlib import Path
 
 from llama_stack.cli.subcommand import Subcommand
@@ -70,7 +71,7 @@ class StackRun(Subcommand):
             BUILDS_BASE_DIR,
             DISTRIBS_BASE_DIR,
         )
-        from llama_stack.distribution.utils.exec import run_with_pty
+        from llama_stack.distribution.utils.exec import run_with_pty, run_with_win
 
         if not args.config:
             self.parser.error("Must specify a config file to run")
@@ -198,4 +199,4 @@ class StackRun(Subcommand):
                 return
             run_args.extend(["--env", f"{key}={value}"])
 
-        run_with_pty(run_args)
+        run_with_win(args) if sys.platform.startswith("win") else run_with_pty(args)