build: Update build process and remove deprecated dependencies

[phala]

Key Changes

Build System

• Replaced nwb with Rollup for bundle generation
• Added proper ESM/CJS/UMD build outputs with appropriate package exports
• Improved CSS processing using Sass (replacing node-sass-chokidar)
• Added environment-specific build configurations
• Removed nwb.config.js in favor of rollup.config.js

React Framework Updates

• Upgraded to React 18 (from React 16)
• Converted class components to functional components with hooks
• Migrated from React-Redux v5 to v8 with hooks-based API
• Renamed component files from .js to .jsx for better tooling support

Component Structure

• Flattened component directory structure for simpler imports
• Added new components: AttachmentMessage, LinkifyWrapper, Markdown
• Replaced react-mark-ii with react-markdown for enhanced markdown support

Dependencies

• Updated all dependencies to latest compatible versions
• Removed deprecated packages:
  • recompose (no longer maintained, functionality now in React hooks)
  • node-sass-chokidar (replaced with sass)
  • esdoc and related plugins (outdated documentation generator)
  • @prk/eslint-config and @prk/prettier-config (replaced with direct configs)
• Established explicit React 18 peer dependency requirement
• Added Node.js and Yarn version requirements in package.json

Breaking Changes

This is a major version upgrade (v2.0.0) and includes several breaking changes:

• React 18 is now required (previously supported older React versions)
• Node.js 18.0.0 or higher is required (was previously 8.12.0)
• Yarn 1.22.0 or higher is recommended for package management
• Build output structure has changed
• Some component APIs have been updated to use current React patterns