Macro object_store_impl_method_body

macro_rules! object_store_impl_method_body {
    ($object_store:expr, $method_name:ident ($($args:expr),*).await) => { ... };
    ($object_store:expr, $method_name:ident ($(, $args:expr)*)) => { ... };
}

This macro routes the object store operation to the real implementation by the ObjectStoreImpl enum type and the path.

Except for InMem,the operation should be performed on remote object store.