[v23.2.x] schema_registry: Add support for DELETE /config/{subject}
#14382
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Adds `seq_writer::delete_config`, which deletes the stored compatibility level for a given subject by producing an empty-valued config write. Also adds `sharded_store::get_subject_config_written_at` which returns the sequence number history of a subject's config. This differs from `get_subject_written_at` in that the sequence markers returned cannot be used to perm delete the subject itself, only the config. Therefore, there is no need to soft-delete a subject before fetching this info. (cherry picked from commit ac100ad)
Adds a handler for the delete endpoint. To match the behavior of the reference implementation, this endpoint: - Returns the compatibility level of the subject before deletion - OR subject_not_found if no compatibility level was previously set (cherry picked from commit 03e2a34)
(cherry picked from commit c36c9ab)
(cherry picked from commit df1a49d)
oleiman
approved these changes
Oct 25, 2023
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Backport of PR #13557
Fixes: #14380,