修复get_random一个问题，添加Held配置文件

[GnoCiYeH]

User description

之前的random有问题，应该使用Vec而不是Vec，导致拷贝时src与dst长度不符合而panic

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Type

Bug fix, Documentation

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Description

此拉取请求包含两个主要更改：

1. 修复了get_random系统调用中的一个问题，现在使用Vec<u8>而不是Vec<usize>来避免长度不匹配导致的panic。
2. 添加了Held配置文件，这是一个中断文本编辑器的配置。

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Changes walkthrough

	Relevant files
Bug fix	misc.rs 修复get_random系统调用问题                                                                                              kernel/src/syscall/misc.rs 修复了get_random系统调用中的一个问题，现在使用Vec<u8>而不是Vec<usize>来避免长度不匹配导致的panic。
Documentation	held-0.1.0.dadk 添加Held配置文件                                                                                                              user/dadk/config/held-0.1.0.dadk 添加了Held配置文件，这是一个中断文本编辑器的配置。

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[dragonos-community-ai-pr-reviewer]

PR Description updated to latest commit (50624d2)

[dragonos-community-ai-pr-reviewer]

PR Analysis

• 🎯 Main theme: 此拉取请求主要修复了get_random系统调用中的一个panic问题，并添加了Held配置文件。
• 📝 PR summary: 此PR解决了get_random系统调用因使用错误的数据类型而导致的问题，并新增了用于中断文本编辑器的Held配置文件。
• 📌 Type of PR: Bug fix, Documentation
• 🧪 Relevant tests added: 无法确定，需要查看测试文件。
• ⏱️ Estimated effort to review [1-5]: 3，因为需要检查修复是否正确，并验证新添加的配置文件是否符合预期。
• 🔒 Security concerns: No，此PR代码更改不会引入潜在的安全问题。

PR Feedback

• 💡 General suggestions:

  • 对于修复，应确保所有使用get_random的地方都更新为使用Vec<u8>。
  • 添加的Held配置文件应包含必要的说明，以便其他开发者可以轻松理解和使用。

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[dragonos-community-ai-pr-reviewer]

PR Code Suggestions

	Suggestions
bug	Change the bit shift operation to bitwise AND to prevent potential overflow.  Convert the bit shift operation to use the bitwise AND operator to avoid potential overflow. kernel/src/syscall/misc.rs [80] -80 + ret.push((rand >> (offset * 2)) as u8); +80 + ret.push((rand & (0x0F << (offset * 2))) as u8);
enhancement	Add a description for the BuildFromSource task.                  Add a description for the BuildFromSource task to clarify the build process. user/dadk/config/held-0.1.0.dadk [6-7] 6 + "Git": { +7 + "description": "Clone the repository and build from source with DragonOS's build system."

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