[clang] [libclang/python] Add `Cursor.from_translation_unit` (PR #140496)

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``````````bash
darker --check --diff -r HEAD~1...HEAD clang/bindings/python/clang/cindex.py clang/bindings/python/tests/cindex/test_cursor.py
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``````````diff
--- tests/cindex/test_cursor.py	2025-05-19 06:20:55.000000 +0000
+++ tests/cindex/test_cursor.py	2025-05-19 06:25:20.022200 +0000
@@ -1067,6 +1067,6 @@
 
     def test_cursor_from_tu(self):
         tu = get_tu("int a = 0;")
         cursor = Cursor.from_translation_unit(tu)
         reference_cursor = tu.cursor
-        self.assertEqual(cursor, reference_cursor)        
+        self.assertEqual(cursor, reference_cursor)

``````````

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https://github.com/llvm/llvm-project/pull/140496