[2/4][Refactor] Refactor torchair utils (#1892)

There is a lot torchair specified logic in common code. It results hard
code maintenance. We will create a new torchair module to launch
torchair related logic there. I plan to add 4 PR.

1. Refactor worker
2. Refactor utils (this PR)
- simple change that move all torchair related util function to torchair
module
3. Refactor model_runner
4. Refactor attention

- vLLM version: v0.9.2
- vLLM main:
8188196a1c

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/worker/model_runner_v1.py

@@ -79,11 +79,12 @@ from vllm_ascend.attention.mla_v1 import (AscendMLAMetadata,
                                           CommonAttentionMetadata)
 from vllm_ascend.platform import NPUPlatform
 from vllm_ascend.sample.rejection_sampler import AscendRejectionSampler
+from vllm_ascend.torchair.utils import (check_torchair_cache_exist,
+                                        write_kv_cache_bytes_to_file)
 from vllm_ascend.utils import (ACL_FORMAT_FRACTAL_ND, ACL_FORMAT_FRACTAL_NZ,
-                               ProfileExecuteDuration,
-                               check_torchair_cache_exist, is_310p,
+                               ProfileExecuteDuration, is_310p,
                                maybe_converting_weight_acl_format,
-                               vllm_version_is, write_kv_cache_bytes_to_file)
+                               vllm_version_is)
 from vllm_ascend.worker.eagle_proposer_v1 import EagleProposer
 from vllm_ascend.worker.mtp_proposer_v1 import MtpProposer
 from vllm_ascend.worker.npu_input_batch import CachedRequestState, InputBatch