Storage: Query stats within a namespace (#97403)

pkg/storage/unified/sql/testdata/mysql--resource_stats-query-namespace.sql

@@ -0,0 +1,14 @@
+SELECT
+  `namespace`,
+  `group`,
+  `resource`,
+  COUNT(*),
+  MAX(`resource_version`)
+FROM `resource`
+WHERE 1 = 1
+  AND `namespace` = 'default'
+GROUP BY 
+  `namespace`,
+  `group`,
+  `resource`
+;