Add Patch for LLM Server (#379)

Small patch reflecting some recent changes in `sf.Program` and
`sf.ProgramFunction`.

Was originally included as part of this PR, which adds an integration
test to shortfin llm serving:
#373

But, parsing it out, since that may take a little more time to make
adjustments/add workflow file.

Without it, you get the following error when trying to launch the
server:

```text
[2024-10-30 11:59:09.939] [info] [manager.py:40] System manager command processor stopped
[2024-10-30 11:59:09.991] [error] [on.py:121] Traceback (most recent call last):
  File "/home/amd/stephen/repos/forks/SHARK-Platform/.venv/lib/python3.12/site-packages/starlette/routing.py", line 693, in lifespan
    async with self.lifespan_context(app) as maybe_state:
  File "/home/amd/.pyenv/versions/3.12.5/lib/python3.12/contextlib.py", line 210, in __aenter__
    return await anext(self.gen)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/amd/stephen/repos/forks/SHARK-Platform/.venv/lib/python3.12/site-packages/shortfin_apps/llm/server.py", line 42, in lifespan
    service.start()
  File "/home/amd/stephen/repos/forks/SHARK-Platform/.venv/lib/python3.12/site-packages/shortfin_apps/llm/components/service.py", line 69, in start
    self.inference_program = sf.Program(
                             ^^^^^^^^^^^
TypeError: __new__(): incompatible function arguments. The following argument types are supported:
    1. __new__(cls: object, modules: collections.abc.Sequence[_shortfin_default.lib.local.ProgramModule], *, devices: collections.abc.Sequence[_shortfin_default.lib.local.Device], trace_execution: bool = False, isolation: _shortfin_default.lib.local.ProgramIsolation = ProgramIsolation.PER_FIBER) -> _shortfin_default.lib.local.Program

Invoked with types: nanobind.nb_type_0, kwargs = { modules: list, fiber: _shortfin_default.lib.local.Fiber, trace_execution: bool }

[2024-10-30 11:59:09.991] [error] [on.py:59] Application startup failed. Exiting.
```

With it, you're able to start server, send requests, and receive
responses.

shortfin/python/shortfin_apps/llm/components/service.py

@@ -73,7 +73,7 @@ def start(self):
                 )
             ]
             + self.inference_modules,
-            fiber=self.main_fiber,
+            devices=self.sysman.ls.devices,
             trace_execution=False,
         )
         # Resolve prefill entrypoints.
@@ -393,7 +393,7 @@ async def run(self):
                 "".join([f"\n  {i}: {ary.shape}" for i, ary in enumerate(args)]),
             )
             # Invoke. Logits are of shape [bs, bsl, d].
-            (logits,) = await fn(*args)
+            (logits,) = await fn(*args, fiber=self.fiber)
 
             # Return results.
             for i in range(req_count):