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.

crates/jmap-proto/src/request/parser.rs

@@ -669,6 +669,34 @@ impl<'de> Visitor<'de> for CallVisitor {
                 }
             },
             // inbuxa: journaling
+            (MethodFunction::Get, MethodObject::JournalEntry) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Get(GetRequestMethod::JournalEntry(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
+            (MethodFunction::Query, MethodObject::JournalEntry) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Query(QueryRequestMethod::JournalEntry(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
+            (MethodFunction::Set, MethodObject::JournalExport) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Set(SetRequestMethod::JournalExport(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
+            (MethodFunction::Set, MethodObject::JournalVerification) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Set(SetRequestMethod::JournalVerification(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
             (MethodFunction::Get, MethodObject::Journal) => match seq.next_element() {
                 Ok(Some(value)) => RequestMethod::Get(GetRequestMethod::Journal(value)),
                 Err(err) => RequestMethod::invalid(err),