[red-knot] function signature representation #14304
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Looks good. My main feedback is whether its worth having separate fields for the different parameter kinds or if we instead want to store all parameters in a single slice and only distinguish them by a kind (which I think is what pyright does and we at least considered for the AST because concatenating parameters and always remembering the right order is awkward)
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Summary
Add a typed representation of function signatures (parameters and return type) and infer it correctly from a function.
Convert existing usage of function return types to use the signature representation.
This does not yet add inferred types for parameters within function body scopes based on the annotations, but it should be easy to add as a next step.
Part of #14161 and #13693.
Test Plan
Added tests.