Properly populate JSONDecodeError & UnicodeDecodeError

[TkTech]

We currently raise a ValueError instead of JSONDecodeError (which is a ValueError subclass) in some cases where JSONDecodeError would be more appropriate. This is because upstream simdjson does not report errors with enough granularity to populate lineno and colno (https://docs.python.org/3/library/json.html#json.JSONDecodeError)

Might be viable to return 0 and 0 for now?

[lemire]

Please ping issue simdjson/simdjson#237

This is not a fundamental limitation and it is simply a matter of doing the coding.

[TkTech]

We have the same issue with UnicodeDecodeError here https://github.com/TkTech/pysimdjson/blob/master/simdjson/binding.cpp#L227. However, very few projects I could find seem to care about the additional properties, and those that do use the error in such a way that they would just see a blank string rather than a crash.