Various hardening to REST routes (#1293)

* URL reweriting for static

* request size limits

* improve quotas, make tests work

* remove debugging code

* pass limits to front-end

* fix renaming boggle

server/data_anndata/anndata_adaptor.py

@@ -351,3 +351,11 @@ class AnndataAdaptor(DataAdaptor):
 
     def get_obs_columns(self):
         return self.data.obs.columns
+
+    def get_obs_keys(self):
+        # return list of keys
+        return self.data.obs.keys().to_list()
+
+    def get_var_keys(self):
+        # return list of keys
+        return self.data.var.keys().to_list()