Support EmptyMatchTreatment param for SMB reads

Add a param like Beam's [EmptyMatchTreatment.ALLOW](https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/io/fs/EmptyMatchTreatment.java) unblocking users from passing in possibly empty directories to SMB reads/transforms