chore: rename @modern-js/plugin-rspress to @rspress/modern-js-plugin

[Timeless0911]

Summary

In this PR, @modern-js/plugin-rspress package which used to generate module doc in Modern.js Module projects is renamed to @rspress/modern-js-plugin for better npm permission management.

Since we no longer recommend creating new Modern.js Module projects, as we have developed Rslib based on Rsbuild, which is the next-generation Library development tool that will provide better build performance and plugin ecosystem, we will remove @rspress/modern-js-plugin in Rspress 2.0.

Users who previously used this plugin can continue to use the old version or switch to the new package name.

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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