webpack to vite

[milahu]

part of os-js/OS.js#814

also "umd to esm" because modern browsers support esm

reduce bundle size by

• no minify, no sourcemaps
• dont bundle dependencies. here: hyperapp, @osjs/event-emitter
• esm only, no "umd + esm" hybrid

minify should be the last step in a production build
for development (debugging), "no minify" is better

todo: move vite.config.common.js to a common package = @osjs/dev-meta

todo: write a codemod to automate this process for all osjs packages