Nikolay Yakimov authored Oct 13, 2022 and Moremi Vannak committed Nov 03, 2022

Problem: In `morley-debugger`, there is a case where we want to
throw a custom error that doesn't exist in `MichelsonFailed`. We
should add a new constructor for handling custom failure.

Solution: Add `MichelsonExt` which allow extensible failure,
fix haddock comments.

Co-authored-by: Moremi Vannak