Convert webpack to rspack

[cmdcolin]

This PR proposes using rspack, a "webpack-compatible" js bundler, for dev and production builds of jbrowse2

The rsbuild ecosystem was relatively easy to swap out for our codebase

why change at all

• reduced config
• substantial speedups

why rspack?

• rspack's high compatibility with webpack configs made it very easy to switch
• it also allowed us to remove a lot of webpack config from the ejected cra config because it actually has many nice 'batteries included' features like typescript support, allowing us to remove a lot of babel config
• made dev server, production builds, storybook, and full repo ci much faster
• actually makes bundle size smaller (710kb -> 650kb for gff loading, 1.5Mb -> 942kb for alignments track)
• nice docs, reached "v1.0.0 stability" recently https://rspack.dev/

speed

app	before time	after time	speedup
jbrowse-web yarn start	19s	1s	~19x
jbrowse-web yarn build	27s	3s	~9x
@jbrowse/react-app yarn storybook	100s	1s	~100x**
full repo CI	18minutes	10minutes	~1.8x

**note: this included disabling react-docgen which was slow and seemed unused (?)

why would we maybe not rspack/rsbuild

• still sort of new
• could be fast evolving
• less battle tested (however some components it uses like swc are quite battle tested being used in nextjs, etc.)
• could encounter bugs (i would imagine most bugs would be dev facing (e.g. build error) rather than user facing though)

why not vite?

vite is arguably the most popular bundler, however we have trouble with it

• i have tried making it work but it runs into show stopper errors (see screenshot and branch below)
• even when it partially compiles, it is kinda slow
• gives a bunch of warnings at startup
• has trouble with our 'react on the webworker' construct

Screenshot of vite giving an error:


vite branch of jbrowse-web https://github.com/GMOD/jbrowse-components/tree/vite_web2