feat: support react-docgen-typescript

[fi3ework]

The previous implementation of #58 is wrong, it ports the Vite version react-docgen while react-docgen is implemented by using react-docgen-loader here.

Since Rspack doesn't support essential custom template now, we implement this in Vite builder flavor with Rsbuild's flexible API. Which ported https://github.com/joshwooding/vite-plugin-react-docgen-typescript, thanks for @joshwooding's awesome work.

The current implementations of the docgen and builders are shown in the matrix below:

	react-docgen	react-docgen-typescript
webpack builder	react-docgen-loader	@storybook/react-docgen-typescript-plugin
Vite builder	react-docgen plugin	@joshwooding/vite-plugin-react-docgen-typescript and react-docgen plugin
Rsbuild builder	react-docgen-loader	forked @joshwooding/vite-plugin-react-docgen-typescript in this PR

There's one thing I don't understand, in storybookjs/storybook#19399, why react-docgen is also always enabled even when using react-docgen-typescript. I tried to disable react-docgen, react-docgen-typescript works fine alone anyway.

Friendly ping @joshwooding, thank you for your awesome work of the vite-plugin-react-docgen-typescript and integrations of Vite builder. Could you please explain why react-docgen is always enabled here? Thank you very much!

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[fi3ework]

I will merge this PR for now. Feel free to add any information that might help. Thank you very much.