Scheduled reports: Download, a report for a period as a ZIP

inbuxa:ReportExport/set creates {reportId, from?, to?}: the report built
for that period (its last full one by default, at most 90 days back, as
far as metrics are kept) as a ZIP of summary.txt and the section CSVs,
stored as an upload, mailing nobody. Reading needs sysScheduledReportGet,
as seeing the report does; a tenant administrator downloads only their
own; every download is in the audit log. A download doesn't move the
deliverability baseline the next mail compares with.

crates/jmap-proto/src/references/resolve.rs

@@ -58,6 +58,7 @@ impl Response<'_> {
                 GetRequestMethod::SecurityAcceptance(request) => request.resolve_references(self)?,
                 GetRequestMethod::DeliverabilityReport(request) => request.resolve_references(self)?,
                 GetRequestMethod::DeliverabilitySettings(request) => request.resolve_references(self)?,
+                GetRequestMethod::ReportExport(request) => request.resolve_references(self)?,
                 GetRequestMethod::ScheduledReport(request) => request.resolve_references(self)?,
                 GetRequestMethod::ScheduledReportSettings(request) => request.resolve_references(self)?,
                 GetRequestMethod::Journal(request) => request.resolve_references(self)?,
@@ -150,6 +151,9 @@ impl Response<'_> {
                 SetRequestMethod::DeliverabilitySettings(request) => {
                     request.resolve_references(self, 1, false)?
                 }
+                SetRequestMethod::ReportExport(request) => {
+                    request.resolve_references(self, 1, false)?
+                }
                 SetRequestMethod::ScheduledReport(request) => {
                     request.resolve_references(self, 1, false)?
                 }