Fix #1335: add general-purpose Feature flag system

src/main/java/io/stargate/sgv2/jsonapi/config/feature/DataApiFeatureConfig.java

@@ -0,0 +1,10 @@
+package io.stargate.sgv2.jsonapi.config.feature;
+
+import io.smallrye.config.ConfigMapping;
+import java.util.Map;
+
+/** Configuration mapping for Data API Feature flags. */
+@ConfigMapping(prefix = "stargate.feature")
+public interface DataApiFeatureConfig {
+  Map<DataApiFeatureFlag, Boolean> flags();
+}

src/main/java/io/stargate/sgv2/jsonapi/config/feature/DataApiFeatureFlag.java

@@ -0,0 +1,15 @@
+package io.stargate.sgv2.jsonapi.config.feature;
+
+public enum DataApiFeatureFlag {
+  TABLES("tables");
+
+  private final String featureName;
+
+  DataApiFeatureFlag(String featureName) {
+    this.featureName = featureName;
+  }
+
+  public String featureName() {
+    return featureName;
+  }
+}

src/main/resources/application.yaml

@@ -25,6 +25,10 @@ stargate:
   exception-mappers:
     enabled: false
 
+  feature:
+    flags:
+      TABLES: null
+
   # custom grpc settings
   grpc: