Azure Blob Storage support

[ethe]

In the current, fusio does not support Azure, we could implement traits for Azure, refer to fusio::impls::remotes::aws and object_store::azure

[Xuanwo]

The following pseudocode should work:

use opendal::Operator;
use opendal::services::Azblob;
use fusio_opendal::OpendalFs;

async fn main() -> {
    let op = Operator::new(Azblob::default().bucket("test"))?.finish();
    let ofs = OpendalFs::from(op);

    // Now, use ofs as fusio::Fs!
    let f = ofs.open("path", OpenOptions::default()).await?;
    ...
}

Maybe we can add in docs somewhere?