feat(useFetch): chain callbacks from createFetch and useFetch

[tobyzerner]

Description

Chain beforeFetch/afterFetch/onFetchError callbacks from createFetch and useFetch, rather than useFetch overwriting them.

Additional context

closes #1310

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[climba03003]

It is actually a breaking change.
And overwrite of the functions is valuable feature.
For example, I have all the default behavior placed in createFetch. Then, I have a single route need to handle differently in afterFetch, chaining will raise an error in this case.

It should allow the user to choose which behavior they desire.

[antfu]

@climba03003 That makes sense, do you want to introduce the option to toggle the behavior via another PR to next branch? Thanks.

[climba03003]

I will send a PR when I have time.