feat(theme): add dark and update academy theme

[pearmini]

working on: #5571

• 新增 dark 主题，并且调整 classicDark 主题
• 更新 academy 主题
• 主题可以配置交互的默认值，比如如下的 tooltip

const theme = {
  tooltip: {
    css: {}
  }
}

[coveralls]

Pull Request Test Coverage Report for Build 6270222541

• 19 of 22 (86.36%) changed or added relevant lines in 6 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 88.206%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/theme/academy.ts	5	6	83.33%
src/theme/classicDark.ts	1	2	50.0%
src/theme/dark.ts	4	5	80.0%

Files with Coverage Reduction	New Missed Lines	%
src/runtime/layout.ts	2	92.42%

Totals
Change from base Build 6259097206:	-0.05%
Covered Lines:	10000
Relevant Lines:	10980

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💛 - Coveralls