[Feature Request]: print `qenv.error` automatically

[pawelru]

Feature description

I'm observing more and more use cases where people don't know how to behave when seeing this:

Error in UseMethod("join_keys<-", x) : 
  no applicable method for 'join_keys<-' applied to an object of class "c('qenv.error', 'try-error', 'simpleError', 'error', 'condition')"

(or any other method applied on qenv.error class of object)

Usually the only thing they need to do is to print a given object which should have enough information about the error itself. Now I'm thinking if we can do such print automatically and don't ask users to explicitly print it. We can do print right when the error occurs or print on (any) method calls or something else. Please just make sure to make it easily extendable with regard to methods - anti-pattern would be a new methods: join_keys.qenv.error, join_keys<-.qenv.error and so on... That's not very scalable.

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