feat: generatecode support import element style

[chilingling]

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PR

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our Commit Message Guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)
• [ ] Built its own designer, fully self-validated

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Other... Please describe:

Background and solution

What is the current behavior?

出码包含 element-plus 时，没有引入样式。

Issue Number: #762

What is the new behavior?

增加出码插件，检测到 package.json 中含有 element-plus 插件的时候，往 main.js 中增加 import 语句： import 'element-plus/dist/index.css'

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

Summary by CodeRabbit

• New Features

  • Introduced a new plugin to optionally inject Element Plus styles during application generation.
  • Added a global style dependency plugin for Element Plus, automating the CSS import process in Vue.js applications.
  • Expanded the list of available plugins by exporting the new appendElePlusStylePlugin.
  • Added a README file with setup instructions for the new project structure.
  • Created a mock data structure to facilitate application schema representation.
  • Implemented a data source management system for low-code applications.

• Chores

  • Updated peer dependencies to include @babel/generator.