feat: Add onSuccess and onError interceptors

[Untel]

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• Bugfix
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Hi 👋

I strongly needed a way to have common interceptors (like axios) accross my app to catch generic errors, and share logic across MandeInstances .
I could overload the mande prototype or create a wrapper, but it seems ugly.

I did it really simple, only added onSuccess and onError callbacks, for response only.
I could work on something more complex like axios interceptors (multiple request + response interceptors)
if you see any interest in it.
It will also come with the need to type the newly returned type.
MandeInstance<InterceptedResponseType = { get: () => T, ... }>
But i don't really know if it will be possible (axios don't allow it)

[posva]

This is interesting but it only allows one callback (including globals). I think a lengthier solution would be nice but as a plugin so it doesn't increase mande base size. I will have to take a deeper look another time

[zhiyuanzmj]

How about supporting onRequest, onRequestError, onResponse, onResponseError events？
inspiration by unjs/ofetch

[posva]

Yeah, something similar could be nice. I added an empty interceptors file to src if anybody wants to give it a try