frontend: support `py_binary`
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python frontend
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- MLIR
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Description
`py_binary` doesn't work with the frontend code because RUNFILES_DIR is not set in binary targets by bazel
https://github.com/google/heir/blob/62917facfbaef31e8cd30cc2d46c343c89c1ffe2/heir_py/openfhe_config.py#L83
Based on [this page](https://bazel.build/reference/be/make-variables), I think `BINDIR` may be the env var to use.
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