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Adding safe_load_stream: a ( nearly ) equivalent to load_stream, but safe #724

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Hi !
It seems that some functions have an equivalent safe_ versions, when user controlled yaml files are handled. Looking at CVEs like CVE-2024-42363, and its fix, I implemented a minimal safe_load_stream that handles most relevant use cases.

From a security perspective, it seems that users might benefit from the existence of such a safe variant.
Would be happy to get feedback, add more tests and the like. Thanks !

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