[Chore][V0 Deprecation] Move LogProb to a separate file (#24055)

Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>

vllm/v1/engine/logprobs.py

@@ -7,7 +7,7 @@ from dataclasses import dataclass
 from typing import Optional
 
 from vllm.logger import init_logger
-from vllm.sequence import Logprob, PromptLogprobs, SampleLogprobs
+from vllm.logprobs import Logprob, PromptLogprobs, SampleLogprobs
 from vllm.transformers_utils.detokenizer_utils import (
     AnyTokenizer, convert_ids_list_to_tokens)
 from vllm.v1.engine import EngineCoreOutput, EngineCoreRequest