immerjs / immer / 18508577631

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Replace recursive tree finalization with targeted callbacks

Ported Mutative's "finalization callback" approach as a more targeted and performant implementation for finalization compared to the existing recursive tree traversal approach:

- Added cleanup callbacks for each draft that's created
- Added callbacks to handle root drafts, assigned values, and recursing
  inside of plain values
- Updated state creation to return [draft, state] to avoid a lookup
- Rewrote patch generation system to work with callbacks instead of
  during tree traversal

604 of 634 branches covered (95.27%)

Branch coverage included in aggregate %.

289 of 302 new or added lines in 7 files covered. (95.7%)

1484 of 3926 relevant lines covered (37.8%)

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