[clang] [libclang/python] Add equality comparison operators for File (PR #130383)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

I think the failure in question is
```
 ======================================================================
FAIL: test_file_eq (tests.cindex.test_file.TestFile.test_file_eq)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/__w/llvm-project/llvm-project/clang/bindings/python/tests/cindex/test_file.py", line 32, in test_file_eq
    self.assertNotEqual(file1, file2)
AssertionError: <File: t.c> == <File: s.c>

----------------------------------------------------------------------
```
and I have to idea why this happens.

https://github.com/llvm/llvm-project/pull/130383