Refactor skybox using infinity matrix

[yangfengzzz]

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• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Use epsilon-infinity projection matrix for skybox which will solve orthographic camera render failure bug.
http://terathon.com/gdc07_lengyel.pdf

What is the current behavior? (You can also link to an open issue here)

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

Other information:

[codecov-commenter]

Codecov Report

Base: 33.45% // Head: 33.45% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (28cc156) compared to base (3cca4ab).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev/0.9    #1048      +/-   ##
===========================================
- Coverage    33.45%   33.45%   -0.01%     
===========================================
  Files          333      333              
  Lines        14798    14805       +7     
  Branches      2271     2271              
===========================================
+ Hits          4951     4953       +2     
- Misses        9297     9304       +7     
+ Partials       550      548       -2     

Impacted Files	Coverage Δ
packages/core/src/Camera.ts	9.93% <ø> (ø)
...ges/core/src/RenderPipeline/BasicRenderPipeline.ts	13.70% <0.00%> (+2.22%)	⬆️
packages/core/src/sky/Sky.ts	3.12% <0.00%> (-96.88%)	⬇️
packages/math/src/Color.ts	78.78% <0.00%> (+3.03%)	⬆️

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