add contract errors for SACs #1559
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I've copied the contract errors from the built-in contracts crate.
Questions for specific people:
@briwylde08 Do the notes make sense? I'm sure there are ways they could be reworded or cleaned up, especially the ones that are like "never used i think" lol. Does this chunk of text make sense on the page? In the specific place I have it? Or, should we move it?
@dmkozh I searched in that repo for occurrences of
ContractError::ErrorNameHere
and tried my best to make sense of what I was seeing. Did I capture correctly what each one is doing? What's the best way to handle the "never used" errors?refs: #1499