kio-opendal: KIO interface for OpenDAL

[oowl]

In KDE world, plasma dolphine abstract a KIO interface which support any storage service.

The existing KIO implementations consist of the following:

https://github.com/KDE/kio-gopher
https://github.com/KDE/kio-fuse
https://github.com/KDE/kio-s3

Therefore, it is easy to imagine that if we could integrate OpenDAL, then we could use the capabilities of OpenDAL to allow KIO to read the object storage supported by OpenDAL.

[Xuanwo]

Ideally, we should donate this project to the KDE community. However, I believe it's wise to create a PoC first.