cran, npm, pypi: Add the loader name in the ExtID type

These three loaders get intrinsic metadata from the archive, and use it to build the revision object (mostly authoring and date), which means they would not load the same revision as an other loader given the same archive.

Addresses the comments on e9a8f986.

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Migrated from D5314 (view on Phabricator)

Build is green

Patch application report for D5314 (id=19065)

Rebasing onto 5fd7619f...

Current branch diff-target is up to date.

Changes applied before test

commit 6d3545e47b5e32b98eb0a32717406849063e1bbf
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Tue Mar 23 18:28:39 2021 +0100

    cran, npm, pypi: Add the loader name in the ExtID type
    
    These three loaders get intrinsic metadata from the archive, and use it
    to build the revision object (mostly authoring and date), which means
    they would not load the same revision as an other loader given the
    same archive.

See https://jenkins.softwareheritage.org/job/DLDBASE/job/tests-on-diff/438/ for more details.

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