fix: [arco-markdown-loader] support windows CRLF

[luckyship]

close: https://github.com/arco-design/arco-design/issues/1489

Types of changes

• [ ] New feature
• [X] Bug fix
• [ ] Documentation change
• [ ] Coding style change
• [ ] Refactoring
• [ ] Performance improvement
• [ ] Test cases
• [ ] Continuous integration
• [ ] Typescript definition change
• [ ] Breaking change

Background and context

Solution

How is the change tested?

Changelog

Changelog(CN)	Changelog(EN)	Related issues

Checklist:

• [ ] Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• [ ] Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to master branch)

Other information

[luckyship]

@MisterLuffy can you review this if hava spare time, thanks

[MisterLuffy]

Sorry late for this. arco-scripts has been updated for repo: arco-design.