add rule lua-native-object

[Freed-Wu]

native_objects.lua is a tool
to translate lua to C and LuaJIT FFI lua code.

Usage:

target("foo")
do
    add_rules("luarocks.module", "lua-native-object", "c")
    add_files("*.nobj.lua")
end

Related: #5941

• Before adding new features and new modules, please go to issues to submit the relevant feature description first.
• Write good commit messages and use the same coding conventions as the rest of the project.
• Please commit code to dev branch and we will merge into master branch in feature
• Ensure your edited codes with four spaces instead of TAB.

---

• 增加新特性和新模块之前，请先到issues提交相关特性说明，经过讨论评估确认后，再进行相应的代码提交，避免做无用工作。
• 编写友好可读的提交信息，并使用与工程代码相同的代码规范，代码请用4个空格字符代替tab缩进。
• 请提交代码到dev分支，如果通过，我们会在特定时间合并到master分支上。
• 为了规范化提交日志的格式，commit消息，不要用中文，请用英文描述。

[waruqi]

Thanks, can you help us to add some docs for this rule?

• https://github.com/xmake-io/xmake-docs/blob/master/manual/custom_rule.md
• https://github.com/xmake-io/xmake-docs/blob/master/zh-cn/manual/custom_rule.md