Add sub state machine

[luzhuang]

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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

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[codecov-commenter]

Codecov Report

Patch coverage: 35.43% and project coverage change: +2.64 🎉

Comparison is base (54b48dc) 41.97% compared to head (a174c50) 44.61%.

❗ Current head a174c50 differs from pull request most recent head 4e87cc9. Consider uploading reports for the commit 4e87cc9 to get more accurate results

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Additional details and impacted files

@@             Coverage Diff             @@
##           dev/1.0    #1389      +/-   ##
===========================================
+ Coverage    41.97%   44.61%   +2.64%     
===========================================
  Files          350      358       +8     
  Lines        17787    18173     +386     
  Branches      2598     2671      +73     
===========================================
+ Hits          7466     8108     +642     
+ Misses        9629     9281     -348     
- Partials       692      784      +92     

Impacted Files	Coverage Δ
...ges/core/src/2d/assembler/SlicedSpriteAssembler.ts	6.75% <0.00%> (+1.27%)	⬆️
packages/core/src/RenderPipeline/RenderPass.ts	70.58% <ø> (ø)
...kages/core/src/RenderPipeline/SpriteMaskManager.ts	28.57% <0.00%> (ø)
packages/core/src/Scene.ts	70.55% <ø> (ø)
...ckages/core/src/animation/AnimatorStatePlayData.ts	13.04% <0.00%> (ø)
packages/core/src/lighting/AmbientLight.ts	26.26% <ø> (ø)
packages/core/src/lighting/DirectLight.ts	84.61% <ø> (+65.38%)	⬆️
packages/core/src/lighting/PointLight.ts	18.51% <ø> (ø)
packages/core/src/lighting/SpotLight.ts	10.20% <ø> (ø)
packages/core/src/material/BlinnPhongMaterial.ts	90.90% <ø> (ø)
... and 56 more

... and 39 files with indirect coverage changes

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