[V1] VLM preprocessor hashing (#11020)

Signed-off-by: Roger Wang <ywang@roblox.com>
Signed-off-by: Alexander Matveev <alexm@neuralmagic.com>
Co-authored-by: Michael Goin <michael@neuralmagic.com>
Co-authored-by: Roger Wang <ywang@roblox.com>

tests/v1/engine/test_engine_core.py

@@ -28,6 +28,7 @@ def make_request() -> EngineCoreRequest:
         prompt=PROMPT,
         prompt_token_ids=PROMPT_TOKENS,
         mm_inputs=None,
+        mm_hashes=None,
         mm_placeholders=None,
         sampling_params=SamplingParams(),
         eos_token_id=None,