Markup: Added support for DOM event attributes

[RunDevelopment]

This resolves #2700.

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This is implemented via a new addAttribute function. It works similar to the addInline function and is also part of Markup. Right now, only CSS and JS use it.

JSX had to be changed because the special attributes collided with JSX' script token.

[github-actions]

JS File Size Changes (gzipped)

A total of 4 files have changed, with a combined diff of +146 B (+3.8%).

file	master	pull	size diff	% diff
components/prism-css.min.js	707 B	573 B	-134 B	-19.0%
components/prism-javascript.min.js	1.31 KB	1.45 KB	+141 B	+10.7%
components/prism-jsx.min.js	950 B	957 B	+7 B	+0.7%
components/prism-markup.min.js	897 B	1.03 KB	+132 B	+14.7%

Generated by 🚫 dangerJS against 608e046

[RunDevelopment]

Looking at the file size, it seems like the logic transfer from CSS to Markup worked well. The gain comes from the list of DOM event attributes in JS.