lib.attrsToListRecursive: init

[nukdokplex]

Added lib.attrsets.attrsToListRecursive and lib.attrsets.attrsToListRecursive' and their aliases in root. For further details please check corresponding docstrings.

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[roberth]

This approach was used in the module system for processing the options and it causes unnecessary strictness (worse performance, more errors).
So accepting this runs a risk of making the wrong thing easier.

If we do accept it, which I don't think I would recommend, the function(s) could probably be generalized a bit, and be made to look more like the *With functions we already have, where we take a function to determine the boundary of the recursive structure. The argument (x: x == { }) would then make it behave like attrsToListRecursive' as currently specified in this PR.

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/5706

[nukdokplex]

closing cause similar pr #395160 resolved