Search: Build index from resource stats (#97320)

pkg/storage/unified/sql/data/resource_stats.sql

@@ -0,0 +1,12 @@
+SELECT
+  {{ .Ident "namespace" }},
+  {{ .Ident "group"     }},
+  {{ .Ident "resource"  }},
+  COUNT(*),
+  MAX({{ .Ident "resource_version" }})
+FROM {{ .Ident "resource" }}
+GROUP BY 
+  {{ .Ident "namespace" }},
+  {{ .Ident "group"     }},
+  {{ .Ident "resource"  }}
+;