feat(examples): p/leon/pkgerr

[leohhhn]

Description

Adds a simple package to make your Gno errors match your realm path.

Go wizards tell me if I'm doing something wrong 🙏

[Gno2D2]

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[moul]

I cannot determine whether this pattern is the best or the worst; however, I can say that it deserves to exist and that some people may want to use it.

FYI, I am like you considering providing libraries to improve the error handling experience and also introducing std.GetContext().CurrentFileAndLine().

[thehowl]

nice