Support Google Cloud Storage

[brancz]

Currently, only s3 is supported.

[Xuanwo]

The following pseudocode should work:

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

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

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

[ethe]

Yes it is a possible way at the moment, we will support this natively in this month