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Add an extid_version field to ExtIDs

Nicolas Dandrimont requested to merge generated-differential-D6019-source into generated-differential-D6019-target

This allows distinguishing multiple potential versions of the mapping between external objects and their counterparts archived in Software Heritage, for instance when a loader has a backwards-incompatible change that should result in objects being loaded again.

The field defaults to zero, in which case it's backwards-compatible with the previous implementation in terms of identifier computation.

Related to T3418

Test Plan

new objects added to existing tests

Migrated from D6019 (view on Phabricator)

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