add warning for eval and exec (unsafe usage may lead to critical vulnerabilities)

[DanielRuf]

Documentation

Currently there are no warnings regarding the unsafe usage of eval and exec. If arbitrary user-supplied input is passed to them, this may pose a big security risk.

Relevant PR:

#118437

Blogpost that made me aware of that: https://snyk.io/de/blog/code-injection-vulnerabilities-caused-by-generative-ai/

Linked PRs

• gh-118633: Add warning regarding the unsafe usage of eval and exec #118437
• [3.13] gh-118633: Add warning regarding the unsafe usage of eval and exec (GH-118437) #126161
• [3.12] gh-118633: Add warning regarding the unsafe usage of eval and exec (GH-118437) #126162