feat(image): add img class

[ilvsx]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

Solution

How is the change tested?

Changelog

Type	Component	Changelog(CN)	Changelog(EN)	Related issues
New feature	image	支持自定义图片 class	support custom value class prop
Documentation change	image	文档 API Props 更新	doc API Props update
New UnitTest	image	添加 image 组件单元测试	add unit test

Checklist:

• Test suite passes (npm run test)
• 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 main branch)

Other information

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