fix: Solid bundling now works

[crutchcorn]

Previously, when bundling, the Solid output would include instructions for React.createElement:

As we explored on stream, this isn't easily worked around - even when using ** @jsx ** pragmas:

unjs/unbuild#325

Moreover, the plugin I found that would run during ESBuild:

https://github.com/amoutonbrady/esbuild-plugin-solid/

Has a few problems, namely that we cannot pass plugins to ESBuild inside of unbuild, since they're using the esbuild.transform API and not esbuild.build API (transforming doesn't support plugins but building does)

As such, I had to get clever and:

• Disabled ESBuild entirely
• Moved to fully bundle with Rollup's Babel plugin
• Add in React, TypeScript, and Solid Babel plugins and namespaced them properly

Once this was done, we have the proper output for seemingly everything.

Solid:

React:

Vue (just as an additional dataset):

[cmgriffing]

Amazing work!