Connection parameters for Services besides Connection Options

[simonsan]

So we have this issue in rustic, that we would like to expose more connection parameters to the user via the config file (rustic-rs/rustic#981). For example, we would like to limit the amount of connections being able to be made to 10 for the sftp service. What would be the way to accomplish this using OpenDAL?

We could artificially limit the amount of threads in the thread pool, but I wonder if there is another way, with OpenDAL?

[Xuanwo]

Maybe we can use opendal::layers::ConcurrentLimitLayer?