feat: upload addOnPsting

[pointhalo]

中文模板 / Chinese Template

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What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Test Case
• TypeScript definition update
• Document improve
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PR description

Upload 支持读取粘贴板中的图片，自动添加到 fileList中
对 #1782 中未完善的地方做修改

• API命名改为 addOnPasting（类似于 TagInput中的 addOnBlur的命名逻辑）
• 拆分 permission 检查与 修改 fileList 的逻辑
• 读取粘贴板，不应为阻塞性操作，去掉 await ，改为 promise then回调
• 兼容 mac 操作系统的键盘操作
• disabled时，无需添加事件监听器
• 补充 markdown文档说明
• 去掉多余的imgList，无需为了 pasting 专门多建一个 state承载；且不应该直接操作 fileList，应与主动选择文件一样，保持通过 handleChange承载file追加相关逻辑，否则 maxSize、minSize、limit等检测操作流程会被跳过

Changelog

🇨🇳 Chinese

• Feat：Upload 新增API：addOnPasting，支持读取粘贴板中的图片，自动添加到 fileList中 [Upload] 通过Ctrl+c/v等操作，从剪切板获取图片或者文件并上传的能力 #1612

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🇺🇸 English

• Feat: Upload new API: addOnPasting, supports reading the pictures in the pasteboard and automatically adding to fileList [Upload] 通过Ctrl+c/v等操作，从剪切板获取图片或者文件并上传的能力 #1612

Checklist

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