move topk capturers to srt/state_capturer/ (#24450)

Co-authored-by: Yueming Yuan <yym022502@gmail.com>
Co-authored-by: fzyzcjy <5236035+fzyzcjy@users.noreply.github.com>
Co-authored-by: Ziang Li <ziangli@umich.edu>

test/registered/rl/test_return_routed_experts.py

@@ -9,7 +9,7 @@ import torch
 from torch.nn.utils.rnn import pad_sequence
 
 from sglang.benchmark.utils import download_and_cache_hf_file
-from sglang.srt.layers.moe.routed_experts_capturer import (
+from sglang.srt.state_capturer.routed_experts import (
     extract_routed_experts_from_meta_info,
 )
 from sglang.srt.utils import kill_process_tree