experimental re-embedding (#1186)

* first cut at re-embedding route and back-end support

* update and expand config route tests

* add scanpy_umap

* add reembedding to config route parameters

* front-end support for reembedding fetch and UI

* remove unused imports

* add loading state

* save reembedding in reducer state

* improve withColsFrom

* transmit reembed schema to client; pick unique embedding names

* display embeddings

* format

* lint

* spaces, tab size 2

* lint

* test hack for smoke-test race

* back out hack sleep

* add check for backed mode

* add unit test for reembedding

* lint

* hide re-embedding CLI param from help

server/test/test_writable_annotation.py

@@ -136,3 +136,20 @@ class WritableAnnotationTest(unittest.TestCase):
             all_col_schema["cat_B"],
             {"name": "cat_B", "type": "categorical", "categories": ["label_B"], "writable": True},
         )
+
+    def test_config(self):
+        features = self.data.get_features(self.annotations)
+
+        # test each for singular presence and accuracy of available flag
+        def check_feature(method, path, available):
+            feature = list(
+                filter(lambda f: f.method == method and f.path == path and f.available == available, features)
+            )
+            self.assertIsNotNone(feature)
+            self.assertEqual(len(feature), 1)
+
+        check_feature("POST", "/cluster/", False)
+        check_feature("POST", "/diffexp/", not self.data.config.disable_diffexp)
+        check_feature("GET", "/layout/obs", True)
+        check_feature("PUT", "/layout/obs", self.data.config.enable_reembedding)
+        check_feature("PUT", "/annotations/obs", True)