datastreams: use ROR HTTP reader for funders

[ptamarit]

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Description

• Fixes #311
• This change should work when

  1. 315 is released

  2. inveniosoftware/invenio-app-rdm#2674 is merged and released

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[ptamarit]

This PR would modify the behaviour of the CLI, which we might not want to do. Instead, for now we modify the configuration only in the Celery task in #331.