Extract sample of .c files along with their most popular file name

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Migrated from T4747 (view on Phabricator)

assigned to @vlorentz

assigned to @vlorentz

added Datasets priority:High labels

moved from swh-dataset#4747

added activity::Epic label

mentioned in merge request !196 (merged)

mentioned in merge request !194 (merged)

mentioned in merge request !195 (merged)

mentioned in merge request !201 (merged)

mentioned in merge request !200 (merged)

mentioned in issue #4759 (closed)

marked this issue as related to #4759 (closed)

mentioned in merge request !206 (merged)

mentioned in merge request !204 (merged)

closed with merge request !206 (merged)

mentioned in merge request !261 (merged)