feat!: Replace `web-ext` with `@wxt-dev/runner`

[aklinker1]

Overview

web-ext has few problems:

1. ~20MB install footprint (20% of WXT's total install footprint, even after using my lighter fork, web-ext-run)
2. ~~Relies on --load-extension, which has been deprecated (there are plans to upgrade to using the CDP~~
3. A little slower (see ./scripts/benchmarks/browser-startup.sh)

   Package	Time to open browser (mean, N=20)
   web-ext	634ms
   @wxt-dev/runner	594ms

TODO

• [ ] Can you connect a remote debugger to it?

Manual Testing

cd pacakges/wxt-demo
pnpm dev

This should open your browser.

Related Issue

N/A

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