[#471] Add DUP n

Description

Problem: A new DUP n has been added with the edo procotol (008)! This MR introduces the new DUP n instruction which, provided a stack with at least n items, duplicates the one-indexed n-th item and pushes it to the top of the stack.

Solution: Implement this new instruction in untyped and typed form, support it in the type-checker, interpreter, packer and unpacker, and Lorentz. Replace various existing usages of DIP DUP ; SWAP with DUP 2 and DIP n DUP ; DUG n with DUP n.

This MR also moves various contracts back to 008, which were causing tests to fail.

Related issue(s)

Resolves #471 (closed)

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