allow animations to be aborted

[Rich-Harris]

This is another thing that's basically impossible to check with JSDOM. Might add a test to tests/js/samples instead of trying to create a suitable behaviour test.

It fixes #1458, and should also fix #1462, though I haven't tested that yet.

[codecov-io]

Codecov Report

Merging #1468 into master will increase coverage by 0.21%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master    #1468      +/-   ##
==========================================
+ Coverage   91.15%   91.36%   +0.21%     
==========================================
  Files         124      124              
  Lines        4565     4794     +229     
  Branches     1437     1555     +118     
==========================================
+ Hits         4161     4380     +219     
- Misses        160      162       +2     
- Partials      244      252       +8

Impacted Files	Coverage Δ
src/compile/nodes/Animation.ts	100% <ø> (+25%)	⬆️
src/compile/nodes/EachBlock.ts	98.15% <100%> (ø)	⬆️
src/compile/nodes/Element.ts	94.29% <100%> (+0.92%)	⬆️
src/compile/dom/Block.ts	91.22% <57.14%> (-2.53%)	⬇️
src/compile/nodes/Slot.ts	93.39% <0%> (+2.21%)	⬆️

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