Keep `DioException.toString` clean !!! about dio HOT 4 OPEN

To ignore these useless text, I have to dig into each logging process, each error print process to "Remove" these message, or even ignore entire DioException.

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@ueman Do you want to evaluate the request? I do think that is fair enough, and if we need to change this, we might also consider to support #1949.

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It was introduced since we had a lot of people in the past creating issues for exceptions being thrown due to bad HTTP status codes.

So in contrast to what the issue says, a lot of people do indeed not know HTTP status codes.

I probably wouldn't introduce something like the suggestion but rather make it more verbose in debug mode vs release mode.

That being said, I would like to further understand what the issue with being verbose is.

In most cases, developer will log error to console or file, these messages are useless and annoying. Which developer doesn't know the http code meaning?

I realise that this is a rethorical question, but people who just start out don't know, and for those these kinds of messages are super helpful. Not everyone knows as much as you or I.

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@ueman maybe we can add a configuration, such as static field Dio.loggingMode, then decide the logging format according to this field value. by deafult, it can be set to detail logging

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