[REVIEW] Fix VERSION FileNotFoundError in raft-ann-bench

[jiangyinzuo]

#2285 forgets to include VERSION file, causing _version.py not find VERSION file.

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[jiangyinzuo]

The following python packaging document tells us to add a MANIFEST.in file.
https://packaging.python.org/en/latest/guides/single-sourcing-package-version/#single-sourcing-the-package-version

Before this commit, python3 -m raft-ann-bench.run will report the following error

Traceback (most recent call last):
  File "<frozen runpy>", line 189, in _run_module_as_main
  File "<frozen runpy>", line 112, in _get_module_details
  File "/home/jiangyinzuo/micromamba/envs/rapids_raft/lib/python3.11/site-packages/raft-ann-bench/__init__.py", line 16, in <module>
    from ._version import __git_commit__, __version__
  File "/home/jiangyinzuo/micromamba/envs/rapids_raft/lib/python3.11/site-packages/raft-ann-bench/_version.py", line 22, in <module>
    .read_text()
     ^^^^^^^^^^^
  File "/home/jiangyinzuo/micromamba/envs/rapids_raft/lib/python3.11/pathlib.py", line 1058, in read_text
    with self.open(mode='r', encoding=encoding, errors=errors) as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jiangyinzuo/micromamba/envs/rapids_raft/lib/python3.11/pathlib.py", line 1044, in open
    return io.open(self, mode, buffering, encoding, errors, newline)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/home/jiangyinzuo/micromamba/envs/rapids_raft/lib/python3.11/site-packages/raft-ann-bench/VERSION'

[jiangyinzuo]

Solved in #2299