SQLite backed cache: Support sorting mgmt clusters on value in a specific condition (#447)

* Replace primary/secondary sort fields with an array of sort directives.

* Allow more than 2 sort-params in a search query.

* Add a virtual 'status.ready' field to clusters.

* Rename status.ready -> status.connected

* Set virtual field 'spec.internal' <- spec.displayName == 'local'

* Need to declare all virtual fields to index.

* Ready clusters have condition[type==Ready && status=True]

* Update the README to reflect generalized sorting.

* Bump lasso to get revised sort directives.

* Review-driven changes, mostly comments and drop unneeded code.

* Add unit tests to verify sort-order stringification.

* Ignore empty-string sort components.

* Fix a rebase mishap.

* Drop unneeded commented-out code.

* Clusters have a 'spec.internal' field, no need to synthesize one.

* Added a note on square-brackets for label references.

This should be added to the README for filter queries in the PR for 46333.

* Bump to latest sqlcache-free lasso

pkg/stores/partition/store_test.go

@@ -523,7 +523,7 @@ func TestList(t *testing.T) {
 			},
 		},
 		{
-			name: "sorting with missing primary sort is unsorted",
+			name: "sorting with missing primary sort continues",
 			apiOps: []*types.APIRequest{
 				newRequest("sort=,metadata.name", "user1"),
 			},
@@ -553,8 +553,8 @@ func TestList(t *testing.T) {
 					Count: 3,
 					Objects: []types.APIObject{
 						newApple("fuji").toObj(),
-						newApple("honeycrisp").toObj(),
 						newApple("granny-smith").toObj(),
+						newApple("honeycrisp").toObj(),
 					},
 				},
 			},