feat: add required_if_contains, excluded_unless_contains and excluded_if_contains #1257
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Fixes Or Enhances
#1256
I didn't have too much time to check the current codebase to make sure my implementation fits the current contribution guidelines because I implemented this for a specific use case I had. I'm using it without issues for now...
I didn't like the function renaming I did to add a new parameter but I haven't thought of a better name and wanted to make sure it is compatible with previous implementations.
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