fix(polygon): Improve speed of Polygon.getSignedArea()

[ibgreen]

• Trying to replicate @smcallis promising results in https://github.com/visgl/deck.gl/discussions/9089#discussioncomment-10361993

[coveralls]

Pull Request Test Coverage Report for Build 10433413865

Details

• 14 of 36 (38.89%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 84.862%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
modules/polygon/src/polygon-utils.ts	7	29	24.14%
<!--	Total:	14	36

Totals
Change from base Build 10433220835:	-0.1%
Covered Lines:	14813
Relevant Lines:	17606

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💛 - Coveralls

[smcallis]

Sweet thanks for trying to get this upstreamed.