enhancement request: structured error output

This may be a long shot but life's short so here goes.

When using op in a scripted environment, particularly in a library, I (and others I think as well) sometimes end up scraping[1] standard error in order to discern what went wrong and either recover gracefully or bubble meaningful information up to the caller.

It would be cool if when passing --format json, if the error output would also be JSON-formatted. It could (and should probably!) still go to stderr. But then it could include additional context and be reliably machine parsable.

[1] I'm not sure if op's error output is localized. If it is, this is even more fragile than I realized.

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