[Chore] Remove more V0 dead code from sequence.py (#31783)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/sequence.py

@@ -12,40 +12,6 @@ if TYPE_CHECKING:
 else:
     KVConnectorOutput = Any
 
-VLLM_TOKEN_ID_ARRAY_TYPE = "l"
-
-VLLM_INVALID_TOKEN_ID = -1
-
-
-@dataclass
-class RequestMetrics:
-    """Metrics associated with a request.
-
-    Attributes:
-        arrival_time: The time when the request arrived.
-        first_scheduled_time: The time when the request was first scheduled.
-        first_token_time: The time when the first token was generated.
-        time_in_queue: The time the request spent in the queue.
-        finished_time: The time when the request was finished.
-        scheduler_time: The time spent in the scheduler when this request was
-                        being considered by the scheduler.
-        model_forward_time: The time spent in the model forward pass when this
-                            request was in the batch.
-        model_execute_time: The time spent in the model execute function. This
-                            will include model forward, block/sync across
-                            workers, cpu-gpu sync time and sampling time.
-    """
-
-    arrival_time: float
-    last_token_time: float
-    first_scheduled_time: float | None
-    first_token_time: float | None
-    time_in_queue: float | None
-    finished_time: float | None = None
-    scheduler_time: float | None = None
-    model_forward_time: float | None = None
-    model_execute_time: float | None = None
-
 
 # cannot use msgspec.Struct here because Dynamo does not support it
 @dataclass