Journaling: search, read and export over JMAP, and the chain check

Phase 4 of the journaling spec.

- inbuxa:JournalEntry/query and /get (sysJournalSearch): filter by time,
  sender, recipient, either, direction, subject words, Message-ID and
  journal, newest first; the whole report only when asked for.
- inbuxa:JournalExport/set (sysJournalExport): a reason is required; a
  ZIP of the matching reports with manifest.csv, exceptions.csv and
  manifest.sha256, up to 10,000 reports and 1 GB.
- inbuxa:JournalVerification/set (sysJournalGet): chains and reports
  rechecked.
- Every search, listing, read, export and check is written to the audit
  log before anything is returned, with existing actions only.
- Catalog entries for the three objects; spec as-built notes.

journal_tests: administrators can't search; a Compliance Officer searches,
lists, reads a report, exports (reason required) and checks the chain;
the officer can't change journals; each of those is in the audit log.

resources/privacy/catalog.toml

@@ -136,6 +136,36 @@ retention = "object-life"
 note = ["content"]
 acceptedBy = ["identifier"]
 
+[object."inbuxa:JournalEntry"]
+file = "inbuxa_journal_entry.rs"
+default = "none"
+whose = ["holder", "correspondent"]
+where = ["data-store", "blob-store"]
+scope = "server"
+retention = { setting = "inbuxa:Journal.retentionDays" }
+[object."inbuxa:JournalEntry".properties]
+sender = ["identifier", "contact"]
+recipients = ["identifier", "contact"]
+subject = ["content"]
+messageId = ["identifier"]
+report = ["content", "identifier", "contact", "metadata"]
+
+[object."inbuxa:JournalExport"]
+file = "inbuxa_journal_entry.rs"
+default = "none"
+whose = ["holder", "correspondent"]
+where = ["blob-store"]
+scope = "server"
+retention = { setting = "x:Jmap.uploadTtl" }
+[object."inbuxa:JournalExport".properties]
+blobId = ["identifier", "contact", "content"]
+filter = ["identifier", "contact"]
+reason = ["content"]
+
+[object."inbuxa:JournalVerification"]
+file = "inbuxa_journal_entry.rs"
+default = "none"
+
 [object."inbuxa:LegalHold"]
 file = "inbuxa_legal_hold.rs"
 default = "none"