[PD Perf] replace Queue to FastQueue

[whybeyoung]

The original while True queue polling implementation caused some CPU overhead under high concurrency. To minimize CPU usage, a more efficient approach using a deque combined with a Condition mechanism was adopted.

-            while True:
-                try:
-                    kv_chunk: TransferKVChunk = self.transfer_queue.get(timeout=0.01)
-                    reqs_to_be_processed = (
-                        self.transfer_infos[kv_chunk.room].values()
-                        if kv_chunk.room in self.transfer_infos

See the commit ..

CC @ByronHsu @ShangmingCai @zhyncs @fzyzcjy

[zhyncs]

@whybeyoung May you help fix the conflicts? QQ can you also share some performance results?