Add security notices on PAL and CPAL experimental chains. #9938
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Clearly document that the PAL and CPAL techniques involve generating code, and that such code must be properly sandboxed and given appropriate narrowly-scoped credentials in order to ensure security.
While our implementations include some mitigations, Python and SQL sandboxing is well-known to be a very hard problem and our mitigations are no replacement for proper sandboxing and permissions management. The implementation of such techniques must be performed outside the scope of the Python process where this package's code runs, so its correct setup and administration must therefore be the responsibility of the user of this code.