[Build] Add build info (#1386)

Add static build_info py file to show soc and sleep mode info. It helps
to make the code clean and the error info will be more friendly for
users

This PR also added the unit test for vllm_ascend/utils.py

This PR also added the base test class for all ut in tests/ut/base.py

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

setup.py

@@ -27,6 +27,7 @@ from typing import Dict, List
 
 from setuptools import Extension, find_packages, setup
 from setuptools.command.build_ext import build_ext
+from setuptools.command.build_py import build_py
 from setuptools.command.develop import develop
 from setuptools.command.install import install
 from setuptools_scm import get_version
@@ -78,6 +79,30 @@ class CMakeExtension(Extension):
         self.cmake_lists_dir = os.path.abspath(cmake_lists_dir)
 
 
+class custom_build_info(build_py):
+
+    def run(self):
+        soc_version = envs.SOC_VERSION
+        if not soc_version:
+            raise ValueError(
+                "SOC version is not set. Please set SOC_VERSION environment variable."
+            )
+        if "310" in soc_version and not envs.COMPILE_CUSTOM_KERNELS:
+            raise ValueError(
+                "SOC version 310 only supports custom kernels. Please set COMPILE_CUSTOM_KERNELS=1 to enable custom kernels."
+            )
+
+        package_dir = os.path.join(ROOT_DIR, "vllm_ascend", "_build_info.py")
+        with open(package_dir, "w+") as f:
+            f.write('# Auto-generated file\n')
+            f.write(f"__soc_version__ = '{soc_version}'\n")
+            f.write(
+                f"__sleep_mode_enabled__ = {envs.COMPILE_CUSTOM_KERNELS}\n")
+        logging.info(
+            f"Generated _build_info.py with SOC version: {soc_version}")
+        super().run()
+
+
 class cmake_build_ext(build_ext):
     # A dict of extension directories that have been configured.
     did_config: Dict[str, bool] = {}
@@ -326,7 +351,11 @@ def get_requirements() -> List[str]:
     return requirements
 
 
-cmdclass = {"build_ext": cmake_build_ext, "install": custom_install}
+cmdclass = {
+    "build_py": custom_build_info,
+    "build_ext": cmake_build_ext,
+    "install": custom_install
+}
 
 setup(
     name="vllm_ascend",