feat(attr): add attribute class

[hustcc]

Checklist

• attribute
• testcase

Description of change

增加 attribute 方法，不在分包，其实是针对 scale 的的 attribute 概念封装！

[coveralls]

Pull Request Test Coverage Report for Build 782494200

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• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• 49 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+7.6%) to 7.625%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/util/attribute.ts	0	6	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/geometry/attribute/size.ts	1	42.86%
src/geometry/attribute/indentity.ts	2	44.44%
src/geometry/attribute/shape.ts	3	40.0%
src/geometry/attribute/position.ts	7	21.74%
src/geometry/attribute/color.ts	8	36.84%
src/geometry/attribute/attribute.ts	28	12.0%

Totals
Change from base Build 782242050:	7.6%
Covered Lines:	35
Relevant Lines:	362

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💛 - Coveralls