[kernel] add AscendC op: lightning_indexer and sparse_flash_attention (#4625)

### What this PR does / why we need it?
Provide high-performance AscendC operators lightning_indexer and
sparse_flash_attention to boost the execution performance of the
DeepSeek v3.2 model. Meanwhile, adapt the two AscendC operators to
vllm-ascend framework.

### Does this PR introduce _any_ user-facing change?
No (only underlying operator optimizations, with no user-facing changes)

### How was this patch tested?

- vLLM version: v0.11.2
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

Signed-off-by: MingYang119 <songmingyang@huawei.com>

csrc/sparse_flash_attention/op_host/CMakeLists.txt

@@ -0,0 +1,39 @@
+# This program is free software, you can redistribute it and/or modify it.
+# Copyright (c) 2025 Huawei Technologies Co., Ltd.
+# This file is a part of the CANN Open Software.
+# Licensed under CANN Open Software License Agreement Version 2.0 (the "License").
+# Please refer to the License for details. You may not use this file except in compliance with the License.
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
+# See LICENSE in the root of the software repository for the full text of the License.
+# ======================================================================================================================
+
+add_ops_compile_options(
+        OP_NAME SparseFlashAttention
+        OPTIONS --cce-auto-sync=off
+                -Wno-deprecated-declarations
+                -Werror
+                -fpermissive
+)
+
+set(sparse_flash_attention_depends transformer/attention/sparse_flash_attention PARENT_SCOPE)
+target_sources(op_host_aclnn PRIVATE
+        sparse_flash_attention_def.cpp
+)
+
+target_sources(optiling PRIVATE
+        sparse_flash_attention_tiling.cpp
+)
+
+if (NOT BUILD_OPEN_PROJECT)
+    target_sources(opmaster_ct PRIVATE
+        sparse_flash_attention_tiling.cpp
+    )
+endif ()
+
+target_sources(opsproto PRIVATE
+        sparse_flash_attention_proto.cpp
+)
+
+target_include_directories(optiling PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)