fix(common): explicit error in contractToInterface

[dk1a]

Currently this is essentially an uncaught bug that causes uint256[1 + 2 + 3] to become uint256[], which leads to incorrect system interfaces and libraries
Very minor issue, I imagine people rarely if ever use expressions in static arrays, but an explicit error is better than a weird bug I guess

To actually fix this error and support complex expressions requires unparse of some sort, which solidity-parser doesn't have

nomic's slang does have unparse, and is generally much better (and recently 1.0, which is why I didn't use it for contractToInterface initially)
btw if you want I can migrate contractToInterface to slang when I have time, shouldn't be hard

[changeset-bot]

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