Deprecate PyPI packages

[raprasad]

Tasks

• [ ] Add deprecation notes to the SmartNoise Core PyPI Package
• [ ] Change the README text to prominently indicate deprecation and link to the OpenDP library
• [ ] Update the README to change any email references from @opendp.io to @opendp.org, e.g. on the README page
• [ ] Binaries: These may remain the same and are still in use by other groups including Microsoft
• [ ] setup.py - Add a deprecation warning -- but do not raise an exception as the packages are still in use.

PyPI Page

• https://pypi.org/project/opendp-smartnoise-core/

Related Crate issue

• https://github.com/opendp/smartnoise-core/issues/363