feat: add multi-view plot

[hustcc]

• types 定义
• coding
• unit test
• demo

主要用来实现如下类型的组合图表，充分暴露 G2 的能力（门槛高，是对图形语法的直接透出）：

✅

当然也可以用来绘制多折线，多面积（非拆分形式的）。

[github-actions]

😭 Deploy PR Preview 4978516 failed. Build logs

_{🤖 By surge-preview}

[lgtm-com]

This pull request introduces 3 alerts when merging d207469 into 0ad37a6 - view on LGTM.com

new alerts:

• 3 for Unused variable, import, function or class

[coveralls]

Pull Request Test Coverage Report for Build 343339769

• 60 of 60 (100.0%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 93.84%

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Files with Coverage Reduction	New Missed Lines	%
src/adaptor/geometries/base.ts	1	98.32%

Totals
Change from base Build 342900845:	0.3%
Covered Lines:	3640
Relevant Lines:	3745

---

💛 - Coveralls

[lgtm-com]

This pull request introduces 1 alert when merging f71929b into 0ad37a6 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class