Jonas(Rushan) Jiang

Unfortunately, since pyiceberg does not support write yet, we may not be able to have some meaningful tests on `read_iceberg`. However, it is still possible to utilized external docker containers...

Thanks @blublinsky and @rakeshJn for reviewing this. Based on the discussion in https://github.com/ray-project/deltacat/issues/116#issuecomment-1608478951, we will first contribute this basic reader to deltacat and then contribute back to ray when more...

Seems there is an earlier PR that also tends to fix this issue: #3933 . May be the discussions in that PR can also help here.