VAI: Replace namespace+name default sort with id (#724)

* Sort by ID rather than metadata.namespace,metadata.name

- In tests add an id field to the list of fields to cache/create and to the objects.

* Add benchmark tests to compare sorting by ns/name vs id.

pkg/sqlcache/integration_test.go

@@ -61,7 +61,7 @@ func (i *IntegrationSuite) TearDownSuite() {
 }
 
 func (i *IntegrationSuite) TestSQLCacheFilters() {
-	fields := [][]string{{"metadata", "annotations", "somekey"}}
+	fields := [][]string{{"id"}, {"metadata", "annotations", "somekey"}}
 	require := i.Require()
 	configMapWithAnnotations := func(name string, annotations map[string]string) v1.ConfigMap {
 		return v1.ConfigMap{