new service: Add native ceph rados support

[Xuanwo]

Inspired by https://ceph.io/en/news/blog/2024/ceph-a-journey-to-1tibps/

It must be interesting for opendal to have native ceph rados support

[Xuanwo]

We have a Rust interface for Ceph at https://github.com/ceph/ceph-rust, but it's currently not well-maintained.

[Lancern]

Wanna give it a try. I don't know if anyone is working on this, but I have some progress in my own testing fork.

The ceph-rust crate is almost unusable for several reasons:

• It is not actively maintained for several years;
• Its Rust interface lacks several key features that are indeed required by OpenDAL:
  • Configurations cannot be set until you have connected to the remote cluster;
  • No asynchronous support.

However its raw C library bindgen seems usable. I have built a new binding for testing upon its raw bindgen.

[Xuanwo]

Wow, that's perfect. Thanks for your work!