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new feature: Async support for C binding

1

### Feature Description [OceanBase](https://github.com/oceanbase/oceanbase) currently utilizes libaio to implement async r/w operations for the file system. We hope that OpenDAL C bindings can provide a similar mechanism to enable async...

new feature: provides a way to control memory allocation and deallocation

4

### Feature Description OpenDAL currently does not support allowing callers to take control of memory management, which is crucial for programs based on C and C++. ### Problem and Solution...