feat(parity): receiver STATUS_STATS report and -n --delete lines

Add the STATUS_STATS end-of-transfer receiver report (matched/deleted
counters plus a would-delete path list) behind the report_stats wire
bool, and a read-only delete_extras_list walker.  --stats now renders
true wire byte totals and the receiver-reported deleted count; a
server-contacting -n --delete prints transfer-relative '*deleting' lines
matching rsync's itemize layout.

src/client/change_list.h

@@ -35,6 +35,7 @@ typedef struct {
   bool is_symlink;
   bool is_special;
   bool is_hardlink; /* a hard-link sibling (linked, no data sent) */
+  bool deleted;     /* a would-delete report (-n --delete); no source file */
   const char* symlink_target;
   const char* hardlink_target;
   unsigned long long size;       /* source file length in bytes */