[clang] [libclang/python] Add typing annotations for the Cursor class (PR #138103)

[Vlad Serebrennikov via cfe-commits]

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@@ -1552,68 +1563,83 @@ class Cursor(Structure):
 
     _fields_ = [("_kind_id", c_int), ("xdata", c_int), ("data", c_void_p * 3)]
 
+    _tu: TranslationUnit
+
     @staticmethod
-    def from_location(tu, location):
+    def from_location(tu: TranslationUnit, location: SourceLocation) -> Cursor:
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Endilll wrote:

`clang_getCursor` can return null cursor, so I think we want to wrap the call in `from_cursor_result`, and change the return type to `Cursor | None`.

https://github.com/llvm/llvm-project/pull/138103