Investigate: Register into ObjectStoreRegistry

[matthewmturner]

@seddonm1 i hadnt really dug into this but i believe #20 handles this, right?

[seddonm1]

yes, its very easy:

    let execution_config = ExecutionConfig::new().with_batch_size(32768);
    let mut execution_ctx = ExecutionContext::with_config(execution_config);
    execution_ctx.register_object_store(
        "s3",
        Arc::new(AmazonS3FileSystem::new(None, None, None, None, None, None).await),
    );

[matthewmturner]

Going to add this to readme as well