feat(mutation): add an optional `key` option to mutations

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.00000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 86.67%. Comparing base (1039478) to head (d16cf2d). Report is 2 commits behind head on main.

Files	Patch %	Lines
src/query-store.ts	50.00%	3 Missing :warning:
src/use-query.ts	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #19 +/- ## ======================================= Coverage 86.66% 86.67% ======================================= Files 10 10 Lines 1642 1643 +1 Branches 80 80 ======================================= + Hits 1423 1424 +1 Misses 218 218 Partials 1 1 ```

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