[MISC] Add patch module (#526)

This PR added patch module for vllm
1. platform patch: the patch will be registered when load the platform
2. worker patch: the patch will be registered when worker is started.

The detail is:
1. patch_common: patch for main and 0.8.4 version
4. patch_main: patch for main verison
5. patch_0_8_4: patch for 0.8.4 version

vllm_ascend/utils.py

@@ -51,3 +51,10 @@ def current_stream() -> torch.npu.Stream:
         # we return the default stream.
         _current_stream = torch.npu.current_stream()
     return _current_stream
+
+
+def adapt_patch(is_global_patch: bool = False):
+    if is_global_patch:
+        from vllm_ascend.patch import platform  # noqa: F401
+    else:
+        from vllm_ascend.patch import worker  # noqa: F401