Add db statistic output to CLI db-info command.

Closes #6920

src/CMakeLists.txt

@@ -39,6 +39,7 @@ set(keepassx_SOURCES
         core/Config.cpp
         core/CustomData.cpp
         core/Database.cpp
+        core/DatabaseStats.cpp
         core/Entry.cpp
         core/EntryAttachments.cpp
         core/EntryAttributes.cpp