Implement a MVP for Bulk On-demand Archival feature

Based on the first specification for that MVP, the following must be implemented:

a new Web API endpoint /save/bulk/ to submit a list of origins (and their visit types) for archival swh/devel/swh-web#4802 (closed)
a new lister taking that list of origins as input that verifies their validity and creates ListedOrigin objects in scheduler database swh/devel/swh-lister#4709 (closed)
create or update scheduler CLI command to schedule first loadings of these origins with high priority swh/devel/swh-scheduler#4687

Edited May 21, 2024 by Antoine Lambert

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