added minified versions of .module and .cjs, reduced build size by 50%

[Beilinson]

Added three.module.min.js and three.min.cjs for users serving over import-maps (no tree-shaking).

Type	Regular Size	Minified Size
esm	1.13mb	600kb
cjs	1.15mb	607kb

This can slightly improve load times in low-network areas, and is useful for production code.

[mrdoob]

Considering we're deprecating three.min.js it makes sense to add these. 👍

[marcofugaro]

Hey, sorry to chime in here, but the three.min.cjs build is not necessary since it's used by bundlers and bundlers do their own minification, also it's not specified in the package.json so it will never be used by default.