[Feat] Unquantized Linear to nz and control all nz-cast (#3356)

### What this PR does / why we need it?
Currently, when executing to the Linear layer of models in vLLM-Ascend,
the weights format is ND in unquantized case and skipped ascend case.
This PR supplements the execution logic for Linear layer. We use a new
global variable: VLLM_ASCEND_ENABLE_NZ. When VLLM_ASCEND_ENABLE_NZ=1 and
CANN version is 8.3, the weights of the Linear layer will be converted
to FRACTAL_NZ, in both unquantized case and skipped ascend case. We also
use VLLM_ASCEND_ENABLE_NZ to control the existing NZ conversion, such as
w8a8-quantized case.

### Does this PR introduce _any_ user-facing change?
Add a new global variable VLLM_ASCEND_ENABLE_NZ. If you want to use NZ
format, you should set VLLM_ASCEND_ENABLE_NZ=1.

### How was this patch tested?

- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

Signed-off-by: anon189Ty <Stari_Falcon@outlook.com>

vllm_ascend/utils.py

@@ -65,6 +65,10 @@ def is_310p():
     return _IS_310P
 
 
+def is_enable_nz():
+    return envs_ascend.VLLM_ASCEND_ENABLE_NZ
+
+
 def sleep_mode_enabled():
     global _SLEEP_MODE_ENABLED
     if _SLEEP_MODE_ENABLED is None:
@@ -508,6 +512,7 @@ def register_ascend_customop(vllm_config: Optional[VllmConfig] = None):
     from vllm_ascend.ops.linear import (AscendColumnParallelLinear,
                                         AscendMergedColumnParallelLinear,
                                         AscendQKVParallelLinear,
+                                        AscendReplicatedLinear,
                                         AscendRowParallelLinear)
     from vllm_ascend.ops.rotary_embedding import (
         AscendDeepseekScalingRotaryEmbedding, AscendRotaryEmbedding,
@@ -526,6 +531,7 @@ def register_ascend_customop(vllm_config: Optional[VllmConfig] = None):
         "YaRNScalingRotaryEmbedding": AscendYaRNRotaryEmbedding,
         "MergedColumnParallelLinear": AscendMergedColumnParallelLinear,
         "QKVParallelLinear": AscendQKVParallelLinear,
+        "ReplicatedLinear": AscendReplicatedLinear,
         "DeepseekScalingRotaryEmbedding": AscendDeepseekScalingRotaryEmbedding,
         "VocabParallelEmbedding": AscendVocabParallelEmbedding,
         "ParallelLMHead": AscendParallelLMHead,