Builtin functions implement BuiltinFunction interface

Axel von Bertoldirequested to merge
avonbertoldi/use-builtin-function-type into main

This is the logical followon from Formalize BuiltinFunction to an interface and u... (step-runner!542 - merged). The concrete and legacy_script builtins implement the BuiltinFunction interface introduced in Formalize BuiltinFunction to an interface and u... (step-runner!542 - merged).

Edited by Axel von Bertoldi

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