title: Replace data URL in SAMSum dataset and support streaming
comments: _The documentation is not available anymore as the PR was closed or merged._
body: This PR replaces data URL in SAMSum dataset:
  - original host (arxiv.org) does not allow HTTP Range requests
  - we have hosted the data on the Hub (license: CC BY-NC-ND 4.0)
  
  Moreover, it implements support for streaming.
  
  Fix #4146.
  Related to: #4236.
  
  CC: @severo 