Add rawConfig to response errors

[brandon-leapyear]

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Pre-factoring for #1628 and #2650. Maintains rawConfig so that interceptors written as per #1628 can use error.rawConfig to rerun requests.

[chinesedfan]

In adapters, I agree that they should not care about things like combining baseURL with url. But will some users want to get the original config.url by response.config.url?

@brandon-leapyear Thanks for your quick response. But it changes too much and we should reach a consensus before coding. In fact, I reviewed #1628 again and thought it was an improper request, as well as #2391 was a hurried fix. Hope we can avoid making the mistake again.

Personal conclusions,

• Users should save the raw config by themselves, and use that for re-request, instead of relying on error.config or response.config, which are designed for inspecting the final config.
• Adding a rawConfig looks like making users happy, but increasing burdens of axios core.

I am not the decider. Glad to hear your and the community's voices.

[brandon-leapyear]

✨ This is an old work account. Please reference @brandonchinn178 for all future communication ✨

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Yeah, this is perhaps a POC more than anything. Happy to let this PR start the conversation.

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