feat(mutation): add onData and onError hooks

[jbaubree]

@logaretm Following https://github.com/logaretm/villus/issues/189 I did not complicate the thing by giving the possibility of having several onData hooks because, as you said, we are with mutations that are usually executed explicitly. I think this simple addition is enough for mutations. Feel free to edit PR as you need.

[codecov-commenter]

Codecov Report

Merging #197 (166167a) into main (2e3152a) will increase coverage by 0.02%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
+ Coverage   94.01%   94.03%   +0.02%     
==========================================
  Files          21       21              
  Lines         551      553       +2     
  Branches      126      128       +2     
==========================================
+ Hits          518      520       +2     
  Misses         33       33              

Impacted Files	Coverage Δ
packages/villus/src/useMutation.ts	96.77% <100.00%> (+0.22%)	:arrow_up:

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[jbaubree]

@logaretm

[logaretm]

Thank you and very sorry about the delay, I'm not giving enough time for villus.