hun_offsetof

Provides C-like macros: offsetof and containerof

和memoffset crate的区别- Differences between crate memoffset and crate self

1. 基于指针操作，不占用栈空间，支持超大数据结构，无栈溢出风险
2. Pointer-based opertions do not occupy stack space, support super-large data structures, and avoid stack overflow risks.
3. 提供container_of操作
4. Provides the container_of operation.

基于指针的操作属于unsafe范围，如果使用声明宏方式，可能出现嵌套unsafe的编译告 警，而过程宏可以消除这类告警。 Pointer-based operations are unsafe, If the declaration macro mode is used, nested unsafe compilation warnings may be generated, which can be eliminated by procedure macro.