feat: add plugin-revealjs

[Mister-Hope]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 10980872768

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Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 58.636%

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Totals
Change from base Build 10979829312:	0.3%
Covered Lines:	1168
Relevant Lines:	1794

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💛 - Coveralls

[Mister-Hope]

@pengzhanbo

This PR is almost ready with the following things that need to be specially reviewed:

1. To make the layout treeshakable, I define a alias and constanst in plugin, and I am wondering if we can make it more graceful.
2. The mouse scroll view is not working at the demo page, while the original demo from md-enhance (see https://plugin-md-enhance.vuejs.press/guide/content/revealjs/demo.html) is working fine. I already took time to investigate this, but failed to find out the problem.

[pengzhanbo]

• To make the layout treeshakable, I define a alias and constanst in plugin, and I am wondering if we can make it more graceful.

The current implementation seems fine, and further optimization would just be similar to the approach used in other plugins, like (app) => prepareClientConfig(app).

[Mister-Hope]

Any ideas with the second one?