[refactor] refactor weight trans nz and transpose (#4878)

### What this PR does / why we need it?

Now `VLLM_ASCEND_ENABLE_NZ` will have three options:
0: disable nz;
1: only quant case enable nz;
2: enable nz as long as possible;

And `VLLM_ASCEND_ENABLE_NZ`=1 by default.

All cases are shown in the table below:

|  | W4A4 | W4A8 | W8A8 | fp16/bf16 | fp32 |
|---|---|---|---|---|---|
| trans nz | can't support nz | trans nz by default | trans nz by
default | trans nz when VLLM_ASCEND_ENABLE_NZ is 2 | can't support nz |
| transpose | only support not transpose case | only support transpose
case | only support transpose case | linear: only support not transpose
case<br>gmm: only support transpose case | same to fp16/bf16 |

Some exceptional cases:
1. MLAPO op need to do some additional processing on the weights,
including trans nz. If use MLAPO op, some weight will be transformed to
nz forcely;
2. MLA/SFA's weight `W_UV` will be used by op
`torch.ops._C_ascend.batch_matmul_transpose`, and this op can't support
nz currently;

### Does this PR introduce _any_ user-facing change?
Now fp16/bf16 weight will not trans nz by default.

### How was this patch tested?

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: zzzzwwjj <1183291235@qq.com>

vllm_ascend/worker/worker.py

@@ -55,7 +55,7 @@ from vllm_ascend.distributed.parallel_state import init_ascend_model_parallel
 from vllm_ascend.ops.triton.triton_utils import init_device_properties_triton
 from vllm_ascend.platform import NPUPlatform
 from vllm_ascend.utils import (AscendDeviceType, check_ascend_device_type,
-                               enable_sp, get_ascend_device_type, is_enable_nz,
+                               enable_sp, get_ascend_device_type,
                                register_ascend_customop)
 from vllm_ascend.worker.model_runner_v1 import NPUModelRunner
 
@@ -160,7 +160,7 @@ class NPUWorker(WorkerBase):
             used_bytes / GiB_bytes)
 
     def wake_up(self, tags: Optional[list[str]] = None) -> None:
-        if is_enable_nz():
+        if envs_ascend.VLLM_ASCEND_ENABLE_NZ:
             raise ValueError(
                 "FRACTAL_NZ mode is enabled. This may cause model parameter precision issues "
                 "in the RL scenarios. Please set VLLM_ASCEND_ENABLE_NZ=0.")