Implement a bundler designed for production

[Jarred-Sumner]

Currently, bun's bundler is best suited to development. It prioritizes compilation speed over bundle size. I want bun's production bundler to prioritize these things:

• bundle size
• runtime performance
• incremental production bundling fast enough to run in an HTTP request
• onLoad/onResolve plugins & plugin performance. This will enable other frameworks like Vue and Svelte to easily work in Bun.
• compilation speed
• hot module reloading

This work has started in this branch.

The other thing I want as part of this project is a new bundling format which should support:

• CSS files
• image files & binary assets
• minification
• tree shaking
• sourcemaps

This will be a single binary artifact which can either be run directly for bun.js (makes deploys easy) or be uploaded to a server and then extracted

[JakeCooper]

To add to the prod column:

• disabling watch to prevent needless inode assignment for files that won't change

[Electroid]

Closing as a duplicate, since we are tracking bundling here: #121