[NPU] NPU quantization refactoring & more quantization formats support (#14504)

Co-authored-by: TamirBaydasov <mr.jeijy@gmail.com>
Co-authored-by: Tamir Baydasov <41994229+TamirBaydasov@users.noreply.github.com>
Co-authored-by: Савкин Артем <savkinartem@MacBook-Air-Viktoria.local>
Co-authored-by: Edward Shogulin <edward.shogulin@gmail.com>

docs/platforms/ascend_npu_deepseek_example.md

@@ -30,7 +30,6 @@ python3 -m sglang.launch_server \
     --trust-remote-code \
     --attention-backend ascend \
     --device npu \
-    --quantization modelslim \
     --watchdog-timeout 9000 \
     --cuda-graph-bs 8 16 24 28 32 \
     --mem-fraction-static 0.68 \
@@ -88,7 +87,6 @@ python -m sglang.launch_server \
     --mem-fraction-static 0.6 \
     --attention-backend ascend \
     --device npu \
-    --quantization modelslim \
     --max-running-requests 8 \
     --context-length 8192 \
     --disable-radix-cache \
@@ -144,7 +142,6 @@ python -m sglang.launch_server \
     --max-running-requests 352 \
     --attention-backend ascend \
     --device npu \
-    --quantization modelslim \
     --moe-a2a-backend deepep \
     --enable-dp-attention \
     --deepep-mode low_latency \
@@ -216,7 +213,6 @@ do
       --mem-fraction-static 0.81 \
       --attention-backend ascend \
       --device npu \
-      --quantization modelslim \
       --max-running-requests 8 \
       --context-length 8192 \
       --disable-radix-cache \
@@ -279,7 +275,6 @@ do
       --max-running-requests 832 \
       --attention-backend ascend \
       --device npu \
-      --quantization modelslim \
       --moe-a2a-backend deepep \
       --enable-dp-attention \
       --deepep-mode low_latency \